American tennis player Coco Gauff advanced to the third round of the Miami Open after defeating Rebecca Marino in straight sets 6-4 6-3. The sixth-seeded Gauff, who celebrated her 19th birthday the previous week, comfortably secured the victory in just over an hour.
Meanwhile, Ukrainian player Marta Kostyuk declined to shake hands with her Russian opponent Anastasia Potapova after losing in straight sets 6-1 6-3. Potapova, who was warned by the WTA for wearing a Spartak Moscow football shirt at Indian Wells, won the match and progressed to the next round.
In other second-round matches, Jessica Pegula of the United States defeated Canadian qualifier Katherine Sebov 6-3 6-1 and will face fellow American player Danielle Collins in the next round, who beat Viktoriya Tomova 7-6 (7-3) 6-2.
Elise Mertens caused an upset by coming from behind to beat No. 8 seed Daria Kasatkina in three sets, 4-6 6-2 6-2. Paula Badosa and Zheng Qinwen also progressed to the next round after winning their matches against Laura Siegemund and Irina-Camelia Begu, respectively.