New Zealand's Lulu Sun has reached the semifinals of a WTA tournament for the first time in Monterey.
The win continues the remarkable run Sun who will move into the world top 50 rankings for the first time when they are next released,.
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The fist set was tight with neither player had a breakpoint in the first six games, but Sun broke to love in the seventh, with Andreeva missing with a slice at 0-40.
Games then went with serve and at 5-4, Sun got out to a 40-0 lead and on the next point, she put in a big serve that the Russian couldn’t return.
Andreeva left the court to receive medical treatment on her back before the second set began, but she showed no signs of discomfort once the match resumed.
However, Sun kept the pressure on Andreeva, hitting the ball deep and giving her opponent little to work with.
Andreeva struggled to cope and double-faulted on break point to help the Kiwi take the lead and then hold serve before breaking her opponent to take the match.
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Sun, who survived a match point in her second-round win over Maria Lourdes Carle, lost just four points on her serve in the second set, and there were only four occasions when she did not get her first serve in, which highlighted how well she was playing.
In the semifinals, Sun will play the winner of the match between Ekaterina Alexandrova from Russia and China’s Yuan Yue.
Meanwhile, Sun has been drawn against Lucia Bronzetti from Italy in the first round of the US Open, starting on Monday.
They played against each other earlier this month in the second round of qualifying at the Cincinnati Open, with Sun winning 7-6(4) 6-3.
The winner of that match could play against second seed Aryna Sabalenka in the second round.