Serena Williams and Angelique Kerber both survived testing three-set contests on their way into the third round of the Miami Open.
Petra Kvitova got her Miami Open campaign off to a flyer with a straight-sets win over Maria Sakkari.
Teenager Bianca Andreescu beat Elina Svitolina in a three-set thriller to book her place in the final of Indian Wells.
Belinda Bencic marched on into the semi-final of the BNP Paribas Open with a hard-fought three-set win over Karolina Pliskova.
Roger Federer eased into the Indian Wells quarter-final with a comfortable straight-sets victory over Kyle Edmund.
Belinda Bencic came up with some breathtaking tennis to knock out defending champion Naomi Osaka in Indian Wells.
Novak Djokovic unexpectedly lost to Kohlschreiber in Indian Wells, while Simona Halep was knocked out by Vondrousova.
Naomi Osaka maintained her chance of a second consecutive title in Indian Wells with a comprehensive straight-sets win over Danielle Collins.
Roger Federer beat Stefanos Tsitsipas 6-4 6-4 in the Dubai final to claim the 100th title of his extraordinary career.
Roger Federer advanced to the semi-final stage in Dubai with a hard-fought straight-sets win over Marton Fucsovics.
Belinda Bencic beat Petra Kvitova for the first time to earn her second WTA Premier 5 title in Dubai.
Belinda Bencic produced some great tennis to beat Aryna Sabalenka in three sets and earn a quarter-final meeting with Simona Halep in Dubai.
Great Britain beat Serbia 2-0 in the Play-Off after Konta overcame illness to beat Krunic and Boutler earned a classy win over Jorovic.
Johanna Konta hung on to secure a tense three-set win over Anna Bondar that booked Great Britain's place in the play-off against Serbia.
Johanna Konta led by example with a battling display to see off Greek No.1 Maria Sakkari and secure victory for Great Britain.
Great Britain beat Slovenia 3-0 in the Fed Cup after Katie Boulter won in straight sets to get them off to a perfect start.
Naomi Osaka progressed to the Australian Open semi-final and moved ahead in the race for World No.1 with a dominant win over Svitolina.
Rafael Nadal progressed to his fifth Australian Open semi-final with a comprehensive win over rising star Frances Tiafoe.
Elina Svitolina advanced to the Australian Open quarter-finals for the second year in a row with victory over Madison Keys.
Ashleigh Barty beat Maria Sharapova in an exciting three-set match to progress to her first Grand Slam quarter-final.