Alexander Zverev held up by rain in Washington, Stan Wawrinka beaten

Alexander-Zverev plays a shot

Defending Citi Open champion Alexander Zverev was in good nick in his opening match against Malek Jaziri, but rain had the final say on Tuesday.

The top seed won the opening set 6-2 against the Tunisian but then the heavens opened up and play was suspended for the rest of the day.

Three-time Grand Slam winner Stan Wawrinka’s woes continue as he suffered defeat at the hands of Donald Young with the American securing a 6-4, 6-7 (5-7), 7-6 (3-7) victory.

“It was tough. I fought a lot of nerves there, but I’m happy the result was a ‘W’ at the end of the day. It’s tough playing Stan,” Young said.

The 29-year-old will face seventh seed Kei Nishikori in the next round.

Wild card Daniil Medvedev also had a tough encounter as he beat Yosuke Watanuki from Japan 3-6,7-5, 6-1. He will face the ninth seed Denis Shapovalov for a place in the third round.

Marcos Baghdatis, meanwhile, secured a 6-3, 3-6, 6-2 win over Frenchman Benoit Paire, Alex De Minaur was a 6-7 (6-8), 6-2, 6-2 winner over Vasek Pospisil and Jared Donaldson beat Jordan Thompson 6-4, 7-6 (7-4).