LONDON — Nick Kyrgios has served his way into the second round at Wimbledon.
The 15th-seeded Australian hit 42 aces and saved all five break points he faced to beat Denis Istomin of Uzbekistan 7-6 (3), 7-6 (4), 6-7 (5), 6-3.
Kyrgios earned the only break of the match to go 5-3 up in the fourth set before serving out the match.
Kyrgios reached the quarterfinals on his Wimbledon debut in 2014 but had to retire with a hip injury in the first round last year.
Fourth-seeded Alexander Zverev of Germany also advanced, beating James Duckworth of Australia 7-5, 6-2, 6-0.
Angelique Kerber also won a first-round meeting of former Wimbledon runner-ups, beating Vera Zvonareva 7-5, 6-3.
Kerber lost the 2016 final to Serena Williams — who also beat Zvonareva in the 2010 title match — and reached the second round for the seventh straight year.
Zvonareva was playing in her first Grand Slam tournament in three years after a hiatus to get married and have a child. She came through three rounds of qualifying to make the main draw at the All England Club.
Kei Nishikori is into the second round after beating American qualifier Christian Harrison 6-2, 4-6, 7-6 (3), 6-2.