India, June 30 -- Defending champion Jannik Sinner had to come back from a set down twice and regain his composure following a worrisome tumble to the grass in a five-set victory over 50th-ranked Miomir Kecmanovic in the first round of Wimbledon on Monday. A month after his French Open meltdown, the top-ranked Sinner produced a 4-6, 6-3, 6-7 (6), 6-2, 6-3 win that lasted 3 hours and 30 minutes in the honorary opening match on Centre Court reserved for the past year's men's singles champion. Sinner said he was "a little tight in the beginning," noting that it was his first grass-court match of the season. "I'm happy that I turned it around," Sinner said. Lleyton Hewitt, the 2002 champion, remains the only Wimbledon men's singles winner in ...