Heather Watson beats world No 8 Agnieszka Radwanska at Indian Wells

Heather Watson secured the biggest win of her career as she beat world No 8 Agnieszka Radwanska 6-4 6-4 to move into the fourth round of the BNP Paribas Open.

Britain's Watson had never beaten a top-10 player before and had lost to Radwanska at Indian Wells last year, but broke the seventh seed five times on her way to victory in one hour and 33 minutes.

Watson felt she had produced a top-quality performance when it mattered most to clinch the win.

"I've played Agnieszka quite a few times and she's beaten me pretty comfortably every single time," said Watson. "So I knew I was going to have to bring my A-game and play my very best and that's what I did."

I've played Agnieszka quite a few times and she's beaten me pretty comfortably every single time. So I knew I was going to have to bring my A-game and play my very best and that's what I did.

Victory in Hobart in January had given Watson the second title of her career and now the world No 43 will play Spanish 12th seed Carla Suarez Navarro in the last-16 in California after she beat Anastasia Pavlyuchenkova 7-6 (7-4) 6-7(7-5) 6-0.

Watson, 22, had not won a set against Radwanska in three previous WTA meetings but broke in the first game on her second break point and then held her serve to take a 2-0 lead.

Radwanska, who reached the Wimbledon final three years ago, held and then broke back but Watson once again claimed the advantage on a fourth break point.

The rest of the set went with serve before Watson closed out with an ace.

Watson needed just one break point to again take the early advantage in the second set and she then held her serve again, although Radwanska won the third game to love. The Pole seemed to have found some rhythm and, just as in the first set, broke back for 2-2 although she required three break points to do so.

Radwanska eased through her next service game before breaking Watson to make it four games in a row.

The match looked to be swinging Radwanska's way but Watson halted her momentum by getting back on serve and seeing off two break points for an impressive hold to make it 4-4.

Watson won the next game on a second break point before serving out to love for the victory.

Watch Andy Murray v Philipp Kohlschreiber at the ATP Masters 1000 from Indian Wells, live on Sky Sports 3 from 6pm on Monday. For more information on times, head to: http://www1.skysports.com/watch/tennis-on-sky