Elise Mertens (born 17 November 1995) is a Belgian professional tennis player and current world No. 1 in doubles. She reached world No. 1 for the first time in May 2021, the third Belgian to hold the top ranking in either singles or doubles after Kim Clijsters and Justine Henin. Mertens is a four-time major champion in doubles, having won the 2019 US Open and 2021 Australian... Wikipedia