Sydney, Dec. 29 -- Two-time Grand Slam finalist Stefanos Tsitsipas started his season with a gritty victory on Saturday as third-seeded Greece overcame Spain at the United Cup.

Greece, Argentina, Canada and Switzerland were winners on Day 2 of the mixed team tournament.

Despite coming off a lackluster season, world No. 11 Tsitsipas remains a significant drawcard in men's tennis and looms as a contender at the Australian Open, having finished runner-up to Novak Djokovic in 2023.

Tsitsipas had a second set lapse against Spain's Pablo Carreno Busta before regrouping to record a 6-4, 4-6, 6-3 victory in two hours and eight minutes at Perth's RAC Arena.

"I fought it through. In some situations, I really struggled to get back into the matc...