LONDON (AP) Steve Johnson of the United States beat fourth-seeded Richard Gasquet 7-6 (2), 6-2 on a rain-hit opening day of the Wimbledon warmup tournament at Queen's Club on Monday.

In a match that was delayed and then interrupted several times by rain, Gasquet held a set point but failed to serve out the opening set at 5-4.

After being overwhelmed in the tiebreaker, the 10th-ranked Frenchman surrendered an early break in the second set and failed to recover.

All the other main draw matches were postponed.

The tournament features four of the world's top 10 players as they prepare for Wimbledon, which begins June 27.

Andy Murray is re-united with coach Ivan Lendl and heads the 32-player field as he bids for a record fifth Queen's title.

Stan Wawrinka, who is being assisted by former Wimbledon champion Richard Krajicek, is seeded No.2, and Milos Raonic is No. 3 as he works with seven-time major champion John McEnroe.

Krajicek was surprised to receive a call from Wawrinka's principal coach Magnus Norman, but jumped at the chance.

''I'd like to add (to his game),'' Krajicek said. ''Sometimes it can be a bit of extra confidence. I think it can be a combination of things. It can be sometimes a little bit technically, also. So it's different things you bring to the table.''