Sunflower Showdown

The teams were fairly even up until the 1930s, with the series standings at 31–27 in favor of Kansas entering the decade. During the 1930s and 40s, Kansas gained a large lead in the standings with a number of win streaks, including 22 in a row from 1938 to 1947. In 1935 Kansas tied an NCAA record by beating Kansas State five times in the same calendar year, a feat that was only accomplished one other time, when Kansas beat Nebraska five times in 1909.[2]

Both schools were national title contenders in the 1950s, with Kansas State starting the decade in the title game of the 1951 NCAA tournament, and KU winning the title at the 1952 NCAA tournament. Befitting a clash of these titans, one of the best games of the 1951–1952 season was an epic 90–88 overtime victory by #4 KU over #8 K-State in the 1951 Big Seven Holiday Tournament. KU returned to the national title game in the 1953 NCAA Tournament missing back to back titles by 1 point, claiming the league title along the way over a KSU team that had earlier been the top-ranked basketball team in the country.

The rivalry heated up even further with the arrival of Bob Boozer at Kansas State and Wilt Chamberlain at KU in the middle of the decade. In the 1955–1956 season, Kansas State split the season series with KU and won the Big Seven Conference title. The following year, Chamberlain led KU to the league title and a triple-overtime loss to North Carolina in the title game of the 1957 NCAA tournament. Kansas and Kansas State played another classic the following season, when Boozer scored 32 points in a 79–75 double-overtime victory at KU on February 3, 1958, while KSU was ranked #4 and KU was ranked #2. (When the two teams had previously met that season on December 30, 1957, they were ranked #2 and #3 in the country.) Following that season, KSU made another appearance in the Final Four. To close the decade, Kansas State swept the season series from KU on the way to a 25–2 record and a #1 ranking in the final AP Poll for 1959.

Allen Fieldhouse, home of the Jayhawks since 1955

During the 1950s, the two schools also engaged in one-upsmanship in facilities. In prior decades, Kansas State had played their games in Nichols Hall, which doubled as a gymnasium, livestock pavilion, and pool.[8] In the late-1940s the state Legislature approved and paid for the construction of a new and much larger basketball facility. In 1950 Kansas State opened Ahearn Field House, one of the largest basketball facilities in the country at the time, which seated 14,000 spectators. Meanwhile, KU still played their home games on a converted stage in Hoch Auditorium with a seating capacity of 5,500. In response to the construction of Ahearn, the University of Kansas successfully lobbied the Legislature to approve the construction of Allen Fieldhouse, which would seat 17,000.[9] KU opened the facility with a 77–66 victory over Kansas State on March 1, 1955.

This period also saw the beginning of the 'Sunflower Doubleheader', with two non-conference teams visiting the state to play KU and K-State at one venue one night, then switching venues and opponents the following evening. This event was held from 1957 to 1968, and featured national powerhouses such as UCLA, Xavier, San Francisco, St. Joseph's, Cal, and Marquette.

The basketball rivalry between the two schools continued unabated through the 1960s and 1970s, with the two schools competing annually for the Big Eight Conference championship (see chart below). In Dick Harp's last two seasons as the KU coach, the Jayhawks plummeted to losing records of 7–18 in 1962 and 12–13 in 1963. Nevertheless, in the championship game of the Big Eight Holiday Tournament in December 1962, KU posted a surprising 90-88 quadruple-overtime victory over K-State. Also, on February 20, 1965, one of the classic pranks in the series was perpetrated when a pair of 6x12 banners saying "Go Cats, Kill Snob Hill Again" unfurled on the east and west sides of the Allen Fieldhouse scoreboard with eight minutes left in the first half. Unfortunately for the Cats, this did not come to pass, as KU beat K-State 88–66. Another popular "prank" perpetrated by Kansas State students throughout the years is throwing live chickens, painted blue and red, on the court during pre-game introductions, as a taunt at the Kansas mascot, the Jayhawk. For years the Kansas State administration has attempted to stop this practice, and following a nationally televised game on February 19, 2007, PETA complained about it in a letter to KSU President Jon Wefald.

Bramlage Coliseum, home of the Wildcats since 1988

The 1980s saw the return of star power to the schools and arguably the rivalry's most high-profile game. At the start of the decade, Rolando Blackman at Kansas State and Darnell Valentine at KU squared off in some classic match-ups. To close the decade, it was Mitch Richmond (K-State) and Danny Manning (KU) battling.

With Richmond and Manning in their senior years, the 1987–1988 season proved to be momentous in the rivalry. In the first matchup of the season, on January 30, 1988, Richmond scored 35 points to lead Kansas State to a 72-61 win to halt KU's then-record 55-game home winning streak. On February 18, KU turned the tables, prevailing 64–63 in Ahearn Field House to deny K-State a victory over KU in the old field house's last year. In what was supposed to be the rubber game, in the 1988 Big Eight Conference tournament, Kansas State won a decisive victory by a 69–54 score. However, the biggest was yet to come. Both teams qualified for the NCAA tournament, and after three wins apiece in the tournament they faced each other on March 27 in Pontiac, Michigan, for the right to advance to the Final Four. Led by Manning's 20 points, KU turned a tight game into a runaway and prevailed 71–58. They eventually advanced to claim the school's second NCAA Tournament Championship.[10] That game in the Pontiac Silverdome was the first ever meeting between the 'Hawks and the 'Cats not played in Lawrence, Manhattan, or Kansas City, Missouri.

The rivalry slipped in significance after the 1988 season, as K-State slowly declined in the Big 8 and Big 12 conferences and KU saw sustained success under new coach Roy Williams. During Williams' tenure at Kansas, the Jayhawks went 50–6 against the Wildcats. Only occasionally would K-State make some noise, such as the 68–64 win over then-#1 KU in Allen Fieldhouse in 1994.

From 1994 to 2005, KU won 31 straight games against K-State, the longest streak for either school in the series. Also, from 1984 to 2007, KU won 24 straight games on the Wildcats' home floor, the third longest win-streak on an opponents home court in NCAA history.[2] During the latter streak, K-State won seven games against KU, but all were away from Manhattan: four games in Lawrence (1988, 1989, 1994, 2006) and three games in the Big Eight Tournament in Kansas City (1988, 1989, 1993). The streak began in Ahearn Field House, where KU won the final five meetings, and carried over into Bramlage Coliseum, where KU won the first 19 contests. KU's streak at Bramlage Coliseum came to an end on January 30, 2008, when #22-ranked Kansas State upset previously-unbeaten #2 Kansas 84–75.[11]

Michael Beasley, before the 2008 Sunflower Showdown

When Kansas State hired coach Bob Huggins to replace Jim Wooldridge in the 2006 off-season, Huggins sought to reinvigorate the rivalry. At K-State's "Madness in Manhattan" celebration to start the 2006–2007 season, Huggins referred to KU's 23-game winning streak in Manhattan and said that "February 19th is when we break the streak."[12] However, KU swept the season series from Kansas State, and Huggins departed following the season to coach his alma mater, West Virginia University.

The 2007–2008 season presented an intriguing contrast between youth and experience. KU was led by the experienced coach Bill Self and retained a lineup of experienced players. Kansas State was led by a first-year head coach, Frank Martin, and featured one of the top-rated groups of freshman players in the nation. Prior to the season, Kansas State freshman phenom Michael Beasley boasted that "We're gonna beat KU at home. We're gonna beat 'em at their house. We're gonna beat 'em in Africa. Wherever we play we're gonna beat 'em."[13] KU came into the first match-up of the season, on January 30, 2008, with a 20–0 record and a #2 national ranking, but Kansas State prevailed 84–75, ending KU's long winning streak in Manhattan. Kansas State's trip to Lawrence later that year was not as enjoyable for the Wildcats as Kansas won 88–74, leaving Beasley's prophecy unfulfilled. Both schools advanced to the NCAA tournament at the conclusion of the 2008 regular season, and Kansas went on to win its third NCAA Tournament championship.

The rivalry featured three high-profile match-ups during the 2009–2010 season. In the first game on January 30, 2010, in Manhattan with ESPN's College GameDay broadcasting live from the game, Kansas came into the game ranked #2, while Kansas State was ranked #11. KU prevailed in overtime 81–79, in a game that ESPN described as a "classic."[14][15] After the game, Kansas center Cole Aldrich said, "You're going to get done playing basketball, and you're going to look back and say, 'I loved playing that game.'"[14] The Wichita Eagle wrote that the "rivalry is back."[6] The second match-up on March 3, 2010 was the first time since 1958 that both teams were ranked in the top 5 with Kansas at #2 and KSU at #5. With number one seed implications on the line, Frank Martin called it "the biggest game we've ever played at K-State".[16] Kansas went on to win 82–65 and secure sole possession of the Big 12 Championship. The two teams met again in the 2010 Big 12 Men's Basketball Tournament Championship Game with KU ranked #1 in the nation and KSU ranked #9. The Jayhawks won 72–64, completing a three-game sweep of the Wildcats and winning the Big 12 Tournament title.

Coach Bill Self (third from left), on the KU bench

After Frank Martin left K-State in 2012 to take the coaching job with the South Carolina Gamecocks, he was replaced by Bruce Weber, former Illinois head coach. Weber led his first Kansas State team to a co-conference championship with KU in 2013. For Kansas, it was the ninth straight league title and eleventh in twelve seasons; for Kansas State, it was the first regular season conference title since winning the Big Eight in 1977. During the regular season, Kansas swept Kansas State with a 59–55 victory in Manhattan and an 83–62 victory in Lawrence. The two teams met a third time in the finals of the 2013 Big 12 Tournament, where Kansas bested Kansas State 70–54 for the three-game sweep.

The 2013-2014 season saw a season split between the rivals. Kansas won 86–60 in the first meeting in Lawrence, and Kansas State won in Manhattan in overtime, 85–82, with ESPN's College GameDay again broadcasting from the game. After winning in Manhattan again in 2015, Kansas State had won four of the last eight at home since ending KU's 24-game winning streak in Manhattan in 2008. Kansas State has since dropped 4 of the last 5 at home.

One of the ugliest moments in the rivalry's history took place in January 2020 in Allen Fieldhouse, when a brawl erupted between KU and KSU players near the end of an 81-60 Jayhawk win over the Wildcats. The brawl started after KU's Silvio De Sousa had the ball stolen from him by KSU's DaJuan Gordon while attempting to dribble out the last few seconds of the game with a 21-point lead. De Sousa recovered to block a layup attempt and then stood over Gordon. In response to a perceived taunt, the Kansas State bench cleared followed quickly by Kansas' bench, and punches were thrown. The brawl went into the handicap seating area, knocking over fans. At one point De Sousa picked up a chair over his head, but dropped it seeing only KU players in front of him.[17] The brawl resulted in a KU assistant coach suffering a broken arm, multiple school enforced player suspensions, and separate suspensions being handed down from the Big 12.

From 1946 through 1978, Kansas and Kansas State made the competition for the basketball title for their conference (known as the Big Six, Big Seven and Big Eight during this time) virtually a two-way affair. During this 33-year period, KU or KSU won or shared the title 26 times. The following chart shows the conference titles captured by the Sunflower Showdown schools during this span of time. Since 1991 Kansas has won or shared the Big 8[18] and Big 12 titles[19] 24 of the 30 years. Kansas and Kansas State shared the Big 12 regular-season title for the 2012–2013 season.[19]