Caroline Wozniacki will face Elise Mertens in the last four of the Australian Open and aims to make amends for a 2011 defeat to Li Na.
Rafael Nadal suggested the ATP should review its hectic calendar to avoid injuries but Marin Cilic feels players must look after themselves.
NFL Canada played Cupid on Twitter to set up another Super Bowl date between Eugenie Bouchard and student John Goehrke.
Injury cost Rafael Nadal against Marin Cilic, who had already taken control of their Australian Open quarter-final with ruthless aggression.
Carla Suarez Navarro hit back in the second set, but Caroline Wozniacki reached the Australian Open semi-finals at 1.35am.
After his Australian Open campaign was cut short by an upper leg problem, Rafael Nadal said there are "too many people getting injured".
After benefiting from Rafael Nadal's injury-enforced retirement, Marin Cilic said: "It's very unfortunate for him to finish this way."
After reaching her first grand slam semi-final in Melbourne, Elise Mertens said "if you believe in yourself, then anything can happen".
World number one Rafael Nadal was forced to retire from his Australian Open quarter-final against Marin Cilic, trailing 2-0 in the fifth.
Andy Murray has been the main man of British tennis for more than 10 years, but Kyle Edmund is currently the star turn at Melbourne Park.