Siniaková beat No. 14 seeds Bethanie Mattek-Sands/Iga Świątek . In the quarterfinals of Wimbledon, the pair fell to Veronika Kudermetova and Elena Vesnina , despite having four match points for themselves. The Czechs were seeded No. 1 at the Tokyo Olympics in July–August; they won three super tiebreaks (including over Kudermetova/Vesnina) en route to the gold medal match, in which they beat the Swiss team Belinda Bencic/Viktorija Golubic . They were also top-seeded at and won the 2021 WTA Finals, where they twice beat Hsieh/Mertens (in the group stage and final), and Siniaková retook the No. 1 ranking. The pair was named the WTA Doubles Team of the Year for the second time. Krejčíková and Siniaková went undefeated () at the majors in 2022, winning all three Grand Slams that they entered. At the Australian Open, they won their fourth major by beating Anna Danilina and Beatriz Haddad Maia in a close final, . They were unable to defend their French Open title because Krejčíková had to pull out of the doubles draw after testing positive for COVID-19. As No. 2 seeds at Wimbledon, they beat top-seeded Mertens/Zhang in the final . In September, their victory at the US Open completed their career Grand Slam; in the final against the unseeded pair of Caty McNally and Taylor Townsend, the Czechs were down a set and before rallying—Siniaková said "we calmed down a little"—to win . They again reached the final of the WTA Finals, but lost to Mertens/Kudermetova, despite leading at one point in the deciding tiebreak. They were again named WTA Doubles Team of the Year. The duo continued playing well at the start of 2023, making their first ever title defense by winning the Australian Open over Shuko Aoyama/Ena Shibahara in the final . This was their seventh Grand Slam title and stretched their major win streak to 24 matches. Playing style Krejčíková and Siniaková are known as a team with very solid on-court communication, helped by their many years playing together, and a "never give up" attitude. Other skills include quick reflexes at the net (especially Siniaková), smart hitting from the baseline (especially Krejčíková), and lobbing ability. The team makes much use of the I-formation, with the net player crouching at the center of the court while the server stands on the baseline behind her. The contrast of the players' personalities has been noted since their first