Live updates: Big star eliminated from Australian Open on day two as Novak Djokovic and Nick Kyrgios get their tournaments underway; follow all the action here

This could perhaps turn out to be one of the biggest surprises of the fortnight, as world number 12 Stefanos Tsitsipas made a surprising early exit from the Australian Open earlier this afternoon.

The 2023 Australian Open finalist suffered a heavy defeat at the hands of American star Alex Michelsen, who beat his Greek opponent 5-7, 3-6, 6-2, 4-6.

Michelsen, who is ranked 42nd on the ATP Tour, scored one of the biggest wins of his career as a 20-year-old, barring the third set, dominating Tsitsipas at the John Cain Arena.

The result means the Greek star has failed to reach the second round in his last two Grand Slam appearances, with the 2019 ATP Tour Finals winner suffering a loss to Thanasi Kokkinakis at Flushing Meadows last September.