Gauff advances in Dubai

Coco Gauff rallied from a slow start and a second-set argument with the chair umpire to beat Karolina Pliskova 2-6, 6-4, 6-3 and reach the quarterfinals of the Dubai Championships on Wednesday. The third-seeded Gauff ended Pliskova’s 11-match winning streak. The 19-year-old American built a 4-2 lead in the second set before a lengthy back-and-forth with chair umpire Pierre Bacchi. Gauff complained to Bacchi that he called her serve at deuce out only after Pliskova returned it into the net. Gauff had to repeat her first serve and went on to hold for a 5-2 lead. Gauff will next face Anna Kalinskaya after the Russian beat ninth-seeded Jelena Ostapenko 6-4, 7-5. Top-ranked Iga Swiatek advanced to the last eight by beating Elina Svitolina 6-1, 6-4.

Teen collects win in Rio

Joao Fonseca became the first player born in 2006 to win an ATP tour-level match when the 17-yearold Brazilian beat seventh-seeded Arthur Fils 6-0, 6-4 at the Rio Open on Wednesday. Fonseca defeated the No. 36-ranked Frenchman in front of raucous fans at the clay court tournament in Rio de Janeiro. He knelt on the court in tears to celebrate. His opponent in the round of 16 will be Christian Garin of Chile.

Miami director fined

Miami Open tournament director and former Top 10 player James Blake was fined $56,250 for violating tennis’s rules about betting sponsorship, the International Tennis Integrity Agency announced Wednesday. The London-based ITIA said the violation was unintentional and Blake “co-operated fully with the investigation and did not contest the charge.” If Blake breaks the rules again during an 18-month probationary period that began on Feb. 9, the agency said, he would be subject to an 18-month suspension and an additional fine of $131,250. He retired as a player in 2013 after winning 10 singles titles, getting to a career-best No. 4 in the ATP rank- ings and reaching the quarterfinals at three Grand Slam tournaments.