Britain's Cameron Norrie and Johanna Konta both progressed to the quarter-finals of the Mexican Open.
World men's number 64 Norrie claimed a 7-6 (7-5) 4-6 6-3 win over 25th-ranked Argentine Diego Schwartzman.
Women's number 45 Konta made the last eight after a comfortable 6-4 6-1 victory over Russia's Varvara Flink.
Meanwhile, British men's number one Kyle Edmund and compatriot Dan Evans won their matches at a Challenger Series tournament in Indian Wells.
Edmund beat Spaniard Tommy Robredo 6-4 6-4 in the second round to earn his first win of 2019, while Evans claimed a 6-4 6-4 victory over Uzbekistan's Denis Istomin.