MONTERREY, México – Heather Watson produced her best tennis of the season to defeat Caroline Wozniacki and take a place in the semifinals of the Abierto Monterrey Afirme.

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A battle between two of the WTA’s sprightliest movers produced no shortage of entertaining exchanges, yet it was Watson, not the former No.1 on the other side of the net, setting the tone.

In a sparkling display, Watson took the game to Wozniacki from the off, eventually getting her reward with a break in the penultimate game of the opening set. Even a slow start to the second failed to discourage the Briton as she came roaring back, a couple of heavy-duty forehands kick-starting a run of four straight games.

Wozniacki, as ever, battled gamely to end, but she had no answer to her opponent’s inspired tennis, spraying a forehand wide to slip to a 7-5, 6-4 defeat.

“I’m very happy with how I played today. I thought I played very well – I needed to against Caroline because she’s a great player – and I had to fight to the end because I knew she would,” Watson said during her on-court interview. “I just took it point by point and didn’t look too far ahead.

“I think one of her main traits is that she is such a fighter. She makes a lot of balls and makes you really win it. I knew I was going to have to finish a lot of points today, come to net and not be too passive.”

Meeting Watson for a place in the final will be either Caroline Garcia or Pauline Parmentier.

On the other side of the draw, hopes for an all-British final were dashed when Kirsten Flipkens upset No.4 seed Johanna Konta, 6-3, 6-7(2), 6-1. Her reward is a meeting with another unseeded player, Anett Kontaveit, a 6-1, 6-4 winner over Nicole Gibbs.