Serhou Guirassy continued his superb form to fire Borussia Dortmund to a 2-1 win over Sergio Ramos's Monterrey and into the Club World Cup quarter-finals on Monday.

Gauff, a two-time Grand Slam champion, has failed to get past the fourth round in each of her six visits to Wimbledon.

The Spanish international becomes Arsenal's first signing of the close season.

The 22-year-old, sixth in the WTA rankings, has fared less well on the grass courts of south-west London.