American Alex Michelsen claimed the biggest win of his career when he stunned Stefanos Tsitsipas 7-5 6-3 2-6 6-4 in the first round of the Australian Open on Monday as the Greek 11th seed became the first major casualty at Melbourne Park.

Khalil Mack is set to become a free agent for the first time in his 11-year career. Whether the Los Angeles Chargers linebacker decides to test the waters, though, is not the first thought on his mind.

Outside linebacker Khalil Mack is set to hit free agency for the first time in his 11-year career, but he’ll be weighing retirement along with any contract offers he receivers. The 33-year-old said that he was uncertain about his future plans after the Chargers’ 32-12 loss to the Texans in the wild card round on Saturday.