KATIE BOULTER continued her strong end to the season with victory over Wang Xiyu to reach the quarter-finals of the Hong Kong Tennis Open.

Second seed Boulter had to save a set point in a very tight opener before battling her way to a 7-6 (7) 6-4 victory.

After saving five break points in the third game, Boulter dropped serve two games later but recovered to make it 4-4 amid a run of 12 points in a row.