Coco Gauff warms up US Open fans for Serena Williams with victory over Ruse

• Teenager beats Romanian opponent 6-2, 7-6
• French Open finalist faces Madison Keys in next round

Coco Gauff beat Romania's Elena-Gabriela Ruse 6-2, 7-6 to warm up Arthur Ashe Stadium for Serena Williams, who was scheduled to play what could be the final singles match of her career under the lights later on Wednesday.

The 18-year-old Gauff clawed back from 5-3 down in the second set to reach the third round and claim her second consecutive win on the world's largest stage for tennis, the 23,771-capacity crown jewel of Flushing Meadows.