Boulter reaches San Diego final with win over Novarro

The 27-year-old from Leicester, partner of Australia's Alex de Minaur, dominated on her serve, winning more than 87 per cent of first serve points and allowed just two break points opportunities, saving both.

Rain stopped play early in the second set, but the delay did nothing to check Boulter's momentum as she produced an almost perfect set to secure victory.

Boulter will climb to her career-high WTA ranking after the win as she looks to win her first WTA-500 title in what will be the most important game of her career so far.

She will play Marta Kostyuk after she beat American top seed Jessica Pegula in straight sets 7-6 (4) 6-1.

It was the 21-year-old Ukrainian's first win over a top-five player after she came back from 5-1 down in the first set.