Barty's world No.1 最高位の in big danger
Ashleigh Barty's world No.1 最高位の is in serious jeopardy after the Australian was a shock 死傷者 in the second 一連の会議、交渉／完成する of the Canadian Open.
Barty fell to Sofia Kenin 6-7 (5-7) 6-3 6-4 in Toronto in just under two hours on Tuesday, 場内取引員／株価 the American's first victory over a 最高の，を越す-five WTA player.
Barty, playing for the first time since losing in the fourth 一連の会議、交渉／完成する at Wimbledon a month ago, enjoyed a bye in the 開始 一連の会議、交渉／完成する and struggled to find her rhythm on her return to the 回路・連盟.
"I think it was a little rust but I think just in general it was just a bit loose," Barty said.
"At times I was 行方不明の by big 利ざやs, which is not something that I'm used to or comfortable with, but it's not panic 駅／配置するs.
"It's my first match on hardcourt in a long time."
The French Open 支持する／優勝者 took the first 始める，決める against Kenin after racing out to a 5-1 lead in the tiebreaker.
But Kenin then took 支配（する）／統制する of 訴訟／進行s in the second, carving out a 4-0 lead before stifling a three-game Barty 復帰 to take the match to a third 始める，決める.
World No.29 Kenin nearly squandered a 4-1 cushion in the decider but held her 神経 and の近くにd out the match when a misfiring Barty sent a 決まりきった仕事 forehand long.
"It's very different 条件s here and different coming from home, training in winter at the moment, where the ball is a little lower and here it's やめる lively and quick off the racquet," Barty said.
"All in all, I didn't adjust 井戸／弁護士席 enough or quick enough to the 条件s how I needed to."
The 敗北・負かす means Barty will lose the No.1 最高位の if Japan's Naomi Osaka 勝利，勝つs her second-一連の会議、交渉／完成する match (on Thursday AEST) against German qualifier Tatjana Maria.
The Czech 共和国's Karolina Pliskova also has the chance to take the 最高の，を越す 最高位の this week but must reach the 半分-決勝戦 to have any hope.
Australian Ajla Tomljanovic retired 22 minutes into her 開始 一連の会議、交渉／完成する 衝突／不一致, 追跡するing ポーランドの（人） エース Iga Swiatek 4-1 in the first 始める，決める.
In other first-一連の会議、交渉／完成する 活動／戦闘, Barty's （テニスなどの）ダブルス partner, former world No.1 Victoria Azarenka, （警官の）巡回区域，受持ち区域 Camila Giorgi 6-2 6-2 but seven-time （野球の）満塁ホームラン，（テニスなどの）グランドスラム 支持する／優勝者 Venus Williams 苦しむd a 6-4 6-2 loss to Spaniard Carla Suarez-Navarro.
