Wow, things got heated at the US Open! After a marathon five-setter, Greek star Tsitsi wasn’t happy with Altmaier’s underarm serves and let him know right at the net. The handshake was icy, and Tsitsi even warned Altmaier about getting hit next time. Tough loss for the former World No. 3, who’s still struggling to find his form at majors. Altmaier, meanwhile, moves on to face de Minaur. Thoughts on the underarm serve—fair play or disrespect? #Sports #Tennis #USOpen