After the tournament, Muguruza entered the Top 10 for the first time, moving up to world No. During the US Open series, Muguruza did not enjoy much success, dropping her opening matches in Toronto and Cincinnati to qualifiers Lesia Tsurenko and Yaroslava Shvedova respectively.At the US Open, she recorded her first win at the tournament by defeating German Carina Witthoeft in the first round.She also reached the final of the doubles with Suárez Navarro.The following week, Muguruza retired from her first round match against Suárez Navarro at the Qatar Open while trailing 6–5 in the first set. Plíšková in the third round of the Indian Wells Masters after a second round win over American wildcard Irina Falconi.Muguruza also reached the final of the doubles event with Carla Suárez Navarro, defeating Pavlyuchenkova and Lucie Šafářová; Jarmila Gajdošová and Arina Rodionova and the second seeds, Raquel Kops-Jones and Abigail Spears en route before losing to the top seeds, Cara Black and Sania Mirza in straight sets.The following week, Muguruza chose not to defend her title at the Hobart International and competed at the Sydney International instead, where she reached the quarterfinals, defeating Agnieszka Radwańska for the first time in her career en route.At the Wuhan Open, Muguruza successfully cruised into her second straight quarterfinal at the event after dispatching Sloane Stephens and Ana Ivanovic.
However, she and Romina Oprandi managed to win the doubles event by defeating Katarzyna Piter and Maryna Zanevska in the final in three sets.However, she fell short to Johanna Konta in the following round in three sets, the match was a total time of 3 hours and 23 minutes, the longest women's singles match in that tournament's history since the introduction of tiebreaker in 1970.Muguruza kicked off the Asian swing at the Pan Pacific Open where she successfully advanced to the last eight after defeating Barbora Strýcová before losing to eventual finalist Belinda Bencic in straight sets.Despite this, she rose to a career high singles ranking of world No. A fortnight later, Muguruza reached the third round of the Miami Open after defeating qualifier Sesil Karatantcheva but lost to the eleventh seed Sara Errani after winning the first set.
Muguruza reached the second round of the three clay court events that she competed in leading into the French Open.
; born 8 October 1993 in Caracas, Venezuela) is a Spanish-Venezuelan professional tennis player who represents Spain in tennis competitions and turned professional in 2012. Equipped with powerful groundstrokes and an aggressive game style, Muguruza first came into prominence by reaching the fourth round of the 2014 Australian Open, where she scored an upset over Caroline Wozniacki en route.