Third-seeded Jack Sock, Lincoln, Neb., escaped a close call on Court 1 Sunday, beating unseeded Jeremy Efferding, Lake Worth, Fla., 7-6 (4), 4-6, 7-5, in a boys 16 singles match.
After losing the first set, Efferding broke Sock to go up 5-4 in the second and served for the set.
During the 10-minute break that 16s players get between the second and third sets, Sock said he talked to his coach, who watched the first two sets and “gave me some great advice,” said Sock.
He also drank fluids, rested, and sat in the shade before returning to the court for the third set. Leading 3-2, Sock broke Efferding to go up 4-2.
Sock was serving for the match at 5-4, but was broken . Each player held serve and, leading 6-5, Sock broke Efferding, winning on his second ma tch point in the three-hour match.
“I played doubles yesterday, kinda helped to get used to the courts and get my game going. Today was kinda sketch, but I got through it. We both played pretty well. It was a long match.”

Source: USTA Nationals Staff