Jannik Sinner, aka the Italian Ice, just sent a warning shot to the rest of the field at the Australian Open. After a dominant first-round win (and Gaston’s injury retirement), tennis legends like Jim Courier are saying it’d be a shock if Sinner doesn’t make the final. With his improved serve and new tricks at the net, is anyone ready to challenge the two-time defending champ? #Sports #Tennis #AustralianOpen