Reigning Wimbledon champion Garbine Muguruza on Monday did not hold back her joy at becoming world No. 1 in women's tennis.

The 23-year-old last week topped the WTA rankings for the first time, becoming the second woman from Spain to achieve the feat, after four-time Grand Slam winner Arantxa Sanchez Vicario in 1995.

Between Muguruza, in town for the Pan Pacific Open which started Monday, and men's No. 1 Rafael Nadal, Spain tops both the WTA and ATP rankings at the same time. It is the first country to do since the United States owned both top spots 14 years ago.