Alexander Zverev got the better of older brother Mischa at the Citi Open in Washington on Thursday, winning their first meeting at an ATP Tour event 6-3, 7-5.
Britain's Johanna Konta overpowered Agnieszka Radwanska 6-4, 6-2 in a one-sided victory in the final of the Sydney International on Friday to claim her second career WTA title.
Photos of Day 5 of the Australian Open being played in Melbourne
It was Novak Djokovic's first match this year after his Australian Open hopes were dashed when he was deported following an 11-day saga revolving around his decision not to have a COVID-19 vaccination.
Naomi Osaka continued her stunning run of form with a 6-3, 6-2 victory over 23-times Grand Slam champion Serena Williams in the first round of the Miami Open on Wednesday, the latest big win for the 20-year-old Japanese player.
Fifth seed Maria Sharapova averted an early exit on a sweltering day in Flushing Meadows. Updates from Wednesday's play.
It was Kristyna's first win over a top-five ranked player and she will go on to play fellow Czech Barbora Strycova in the quarter-finals.
Third seed Rafael Nadal battled through mid-match cramps for more than an hour before he lurched into the third round of the Australian Open with a 6-2, 3-6, 6-7(2), 6-3, 7-5 victory over American qualifier Tim Smyzcek.
A dominant Rafael Nadal arrived at one career milestone on Thursday but the speed of the Spaniard's rampage through the early rounds of the French Open suggests his eyes are fixed firmly on another more significant one.
Roger Federer glided to victory on another hot, steamy day at the US Open, the envy of a clutch of men's players made to work overtime on Tuesday at the season's final Grand Slam.
Cilic's booming serve lacked its usual accuracy and Germany's Kohlschreiber was able to control long rallies, pushing the towering Croatian around the court with pinpoint groundstrokes en route to a quick victory.
Second seed Angelique Kerber stayed on track in her quest to unseat Serena Williams as world number one by beating Mirjana Lucic-Baroni of Croatia 6-2, 7-6(7) on Wednesday to reach the third round of the US Open.
List of Australian Open men's singles champions since the event began in 1905 (Australian unless stated):
PHOTOS from day four of the Wimbledon championships at the All England Lawn Tennis and Croquet Club in London on Thursday.
Rafael Nadal easily avoided the embarrassment of a back-to-back first round exits at the Australian Open on Tuesday, ramping up his serve and rattling off 39 winners to beat Florian Mayer 6-3, 6-4, 6-1 on Rod Laver Arena.
List of Australian Open men's singles champions since the event began in 1905 (Australian unless stated):
It was job well done for Novak Djokovic as he silenced Bernard Tomic and his Australian Fanatics with an emphatic 6-3, 6-3, 6-3 victory in the Wimbledon third round on Friday.
IMAGES from Day 3 of the US Open in New York on Wednesday.