Kei Nishikori wants to extend a Grand Slam sequence, but he's not making it easy at the Australian Open

A quick look at the Australian Open: The most anticipated match of the day on Friday is defending champion Caroline Wozniacki against five-time Grand Slam titlist Maria Sharapova

Seven-time champion Serena Williams plays Eugenie Bouchard in the second round and if their pre-match comments are any indication there's some mutual respect there

20-something Americans Frances Tiafoe and Taylor Fritz upset seeded players at the Australian Open to get to the third round in Melbourne for the first time

Maria Sharapova sets up third-round showdown with defending champion Caroline Wozniacki at the Australian Open after 6-2, 6-1 win over Rebecca Peterson of Sweden

Twin brothers Bob and Mike Bryan returned to the Grand Slam stage with a first-round victory at the Australian Open

Serena Williams beats Tatjana Maria 6-0, 6-2 in Australian Open return; Venus Williams needs 3 sets to win

A quick look at the Australian Open on Wednesday: Rafael Nadal will be testing the loyalty and support of Rod Laver Arena fans when he plays an Australian for the second time in a row

The only bug in the system was of the genuine flying variety when Naomi Osaka secured her first win at a major as a Grand Slam champion

Simona Halep came back to win and avoided becoming the first No. 1-seeded woman in 40 years to lose her opening match at the Australian Open