INTERNATIONAL: Stefanos Tsitsipas showed little sign of problem in his elbow, a problem that forced him out of his ATP Cup singles opener. But the tennis player failed to find a way past Diego Schwartzman as the Argentine won an epic battle on Monday to hand Greece a 2-0 defeat.

The ATP Cup is an international outdoor men's tennis tournament played across three Australian cities over ten days and features teams from 24 countries.

The Greek Stefanos Tsitsipas, who had surgery in November and missed Saturday's meeting with Poland's Hubert Hurkacz before playing the doubles rubber, took advantage of Schwartzman's misfiring serve to gain the early advantage at the Ken Rosewell Arena.

He grabbed an early break in the second set but lost his way thereafter as Schwartzman clawed his way back and levelled the contest before fending off a late comeback attempt while up 4-2 in the decider to help Argentina stay unbeaten in Group D.

Federico Delbonis overcame Michail Pervolarakis 7-6(5) 6-1 earlier to put the South Americans in control.

Earlier, Spain's Roberto Bautista Agut beat world number eight Casper Ruud 6-4 7-6(4) in Group A to eliminate Norway, while Georgia were also knocked out after losing to Poland.

Bautista Agut's victory came after Pablo Carreno Busta dispatched Viktor Durasovic 6-3 6-3 to give Spain a 1-0 lead in the tie. The

Spaniards, who won their opener against Chile, face Serbia in their last group match on Wednesday (January 4).

Spain's doubles pairing of Alejandro Davidovich Fokina and Pedro Martinez ensured a clean sweep with a 6-4 6-1 win over Andreja Petrovic and Lukas Hellum Lilleengen.

Kamil Majchrzak put Poland ahead with a 6-1 6-1 win over Georgia's Alexsandre Bakshi in Group D before Hurkacz rallied to beat Aleksandre Metreveli 6-7(5) 6-3 6-1.

Szymon Walkow and Jan Zielinski then beat Aleksandre Bakshi and Zura Tkemaladze 6-7(2) 6-2 10-6 to complete a 3-0 victory for Poland, who can reach the semi-finals if they get past Argentina on Wednesday.

^{PHOTO: HIGHLIGHTS OF ATP CUP GROUP STAGE MATCHES, INCLUDING ARGENTINA'S DIEGO SCHWARTZMAN DEFEATING GREECE'S STEFANOS TSITSIPAS, SPAIN'S ROBERTO BAUTISTA AGUT BEATING NORWAY'S CASPER RUUD AND POLAND'S HUBERT HURKACZ DEFEATING GEORGIA'S ALEKSANDRE METREVELI}