"In 2018, the game was very different to what it is now"

Stefanos Tsitsipas says power is taking over the game of tennis following his first round loss at the Australian Open to American Alex Michelsen.

"I also felt like I didn't have enough power on my shot today," Tsitsipas said following his shock upset defeat.

"I feel like innovation has stepped in and allow players to serve even bigger than before."

World No. 42 Michelsen will now face Aussie James Mccabe in the second round | #AO2025 #AusOpen