US Open 2017: Marin Cilic and Alexander Zverev into second round

Marin Cilic won the US Open in 2014

Croatia's Marin Cilic won his first match since losing the Wimbledon final, beating American Tennys Sandgren in the US Open first round.

The 2014 champion triumphed 6-4 6-3 3-6 6-3 in two hours and 47 minutes.

Fourth seed Alexander Zverev made it into the second round with a straight-set win over Barbados' Darian King.

The 20-year-old German won 7-6 (11-9) 7-5 6-4 in two hours and 49 minutes after an 81-minute opening set and will face Croatia's Borna Coric next.

"Pharrell Williams (right) was sitting in my box," said Zverev, referring to the American musician and designer. "He came up with the outfit. I didn't want to disappoint him."

Spain's 21st seed David Ferrer lost 6-4 3-6 2-6 1-6 to Mikhail Kukushkin.

American 13th seed Jack Sock was another early casualty, losing 6-2 7-6 (14-12) 1-6 5-7 6-4 to Australian Jordan Thompson in just under four hours on Louis Armstrong Stadium.

French eighth seed Jo-Wilfried Tsonga beat Romanian Marius Copil 6-3 6-3 6-4, while American 10th seed John Isner won 6-1 6-3 4-6 6-3 against France's Pierre-Hugues Herbert.

Tsonga will play Denis Shapovalov in the second round, after the Canadian beat Russia's Daniil Medvedev 7-5 6-1 6-2, while Isner faces South Korea's Chung Hyeon.

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Sandgren, ranked 105th in the world, had been due to play Andy Murray, before the Briton's withdrawal on Saturday.

"I feel just a little bit rusty," fifth seed Cilic said after Monday's win.

"I need a few matches to get in the rhythm. I was hitting some good shots and then making some unforced errors," added the world number seven, who will play German Florian Mayer in the second round.

American Sam Querrey, who reached the Wimbledon semi-finals, beat Frenchman Gilles Simon 6-4 6-3 6-4, while Luxembourg's Gilles Muller was a 3-6 6-3 6-4 6-4 winner over Australian Bernard Tomic.