Ranked Halep crashes out of US Open first round

One of 13 Grand Slam champions in the draw, Halep became just the sixth top-seeded woman to lose her opening Grand Slam opening match in the Open Era, the first at the U.S. Open, after Virginia Ruzici at 1979 Australian Open, Steffi Graf at 1994 Wimbledon, Martina Hingis at 1999 and 2001 Wimbledon and Angelique Kerber at 2017 Wimbledon.

Early in the second set, on the way to falling behind by two breaks at 3-0, Halep slammed her racket twice, drawing a warning for a code violation from the chair umpire. The reigning French Open champion has now lost her first match at 12 of 34 career major appearances, a stunningly high rate for such an accomplished player.

Rated as the joint favourite with Serena Williams heading into the event, Halep came unstuck to Kanepi - who played a brilliant match - and made an unwanted piece of history as she became the first women's top seed to lose in the opening round in NY in the Open Era.

U.S. Open favorite Simona Halep was upset in the first round.

But her run in NY was a brief one. World number one retrieved a double break in the second set to get back to 4-4 but the Romanian got broken again and the Estonian held to serve out the match.

"I didn't play great, but she played really well".

She never lost control of the match, even in the second set when Halep appeared to get into more of a rhythm.

"I was thinking about that: Why (did) they cheer so much for her? She played quarter-finals previous year", she said.

Halep had looked ready for a long run in NY after she won the Rogers Cup this month and narrowly missed out on back-to-back titles after losing to Kiki Bertens in the Cincinnati final.

Open where she hasn't lost her debut match since 2009 (K.Chang).

She can take small consolation from the fact she has amassed enough ranking points to remain world number one after the two-week tournament ends.