Naomi Broady beats Jelena Ostapenko in ill-tempered Auckland match

Naomi Broady followed up her win over Ana Ivanovic by storming back from a set down to beat Jelena Ostapenko in an ill-tempered Auckland Classic clash.

The Briton hit 21 aces as she prevailed 4-6 7-6 7-5, but the match was marred by an on-court row after she called for her Latvian opponent to be disqualified.

Tensions boiled over in the second set of the second-round clash when, after a winner by Broady, the 18-year-old Ostapenko's racquet came out of her hand, bounced off the blue hard court and against the back wall towards the ball boy.

"She threw the racquet and hit the ball boy, no way was that accidental," the 25-year-old Broady complained to the umpire.

Play was delayed as the umpire and ball boy had a conversation. The umpire opted for a code violation over a disqualification after the Latvian wildcard argued the racquet slipped from her hand but a clearly upset Broady called for another official to adjudicate.

"I asked for the tournament referee to come down onto the court to give his opinion," Broady said.

"But as he isn't the chair umpire, he goes by what the chair umpire says and his opinion was that it had slipped from her hand, as Jelena had said, so it was just a code violation and move onto the next point."

Broady settled quicker to take the tiebreak and force a deciding set but she looked down and out as she trailed 5-1 in the third.

But the British qualifier saved a second match point as she stormed back to take the set 7-5 and book a spot in the quarter-finals, where she will face American fifth seed Sloane Stephens.

Both players shook hands at the end of the contest but bad blood remained, with Broady clearly angry about the incident and repeating her accusation that Ostapenko intentionally threw her racquet in the second set.

The umpire attempted to quell the trouble as the players continued their verbal volleys.

"Jelena commented that my behaviour was terrible," Broady said. "Which I thought was a bit out of order, considering the events that had gone on in the match. I don't think I did anything disrespectful to her or anyone else on the court.

"So I'm not really sure where that came from, but tensions were high, adrenaline was going. We had a bit of a confrontation, but she's going to be a fantastic player and I'm sure we'll both learn from any mistakes we made today and move forwards."  

Meanwhile, Austrian qualifier Tamira Paszek beat two-time Grand Slam champion Svetlana Kuznetsova to follow up a victory over former French Open champion Francesca Schiavone.

Third seed Caroline Wozniacki won the first 11 games in a 6-0 6-2 win over Christina McHale.