San Diego Open: Fernandez forced to retire after winning first set

German Tatjana Maria reached the second round of the San Diego Open when Canadian Leylah Fernandez, the No 8 seed, retired at the Barnes Tennis Center on Tuesday night.

Maria, ranked No 47, was ahead in the second set with the score at 6-7 (7), 4-0 when Fernandez, ranked No 32, was forced to retire due to a left shoulder issue.

The 36-year-old German will face Australian qualifier Daria Saville next.

San Diego WTA 500, other first-round results (Barnes Tennis Center, hard, USD 922.573, most recent results first):

• Caroline Wozniacki vs. Anna Blinkova
• Donna Vekic vs. Katherine Hui
• Taylah Preston vs. Magdalena Frech: tuesday
• Katerina Siniakova beat Mai Hontama (Q): 6-3, 6-1
• Dayana Yastremska (5) beat Caroline Dolehide: 6-4, 5-7, 6-1
• Marta Kostyuk (6) beat Ann Li (Q): 6-4, 4-6, 6-2
• Xinyu Wang beat Clara Tauson: 6-2, 2-6, 6-1
• Marina Stakusic (Q) beat Marina Melnikova (Q): 6-4, 5-7, 6-1
• Daria Saville beat Lin Zhu: 6-3, 6-3
• Jule Niemeier (Q) beat Varvara Gracheva: 6-3, 6-0
• Katie Boulter beat Lesia Tsurenko: 6-3, 6-1