Fellow Croat Marin Cilic, a finalist at the 2018 Australian Open, used his experience to down Austria's Dennis Novak 6-7 (7-4), 6-4, 6-4, and ensure Croatia won the tie in Sydney.
"After the first set I went to a break with Thomas, and I came out and changed a little bit my game and fought back", Novak said.
US Open champion Rafael Nadal was not required for double duty in Spain's tie with Uruguay in Perth, which saw him hammer Pablo Cuevas 6-2 6-1 to give his country an unassailable lead.
For his part, after his spectacular debut in the tournament against Georgian Aleksandre Metreveli (6-0, 6-0), Bautista returned to deploy his superiority in Perth, where he hardly needed 57 minutes To sign a new win.
The 33-year-old Spaniard came out on top winning 7-6, 6-3 on that occasion but is expecting a hard match when the pair meet again in Australia.
"From my side we will do things to try to raise money for this bad thing.so I am here to help in any way that is possible and I'm sure we will be able to, together with the rest of the players, help to raise important money for this disaster", Nadal said. "We'll bring back our full intensity for our match against France in a couple days time".
Tennis superstars Maria Sharapova and Novak Djokovic are the latest athletes to offer support to the ongoing efforts to battle the Australian bushfires with the pair giving messages of support as well as donations. "My staff stayed with me, instructed me to remain focussed within the match. I mean tonight was brutal", he said. "In these kind of matches a few points really decide the victor".
The group stage of the 24-team ATP Cup is being staged in Sydney, Brisbane and Perth.
MILAN • Mario Balotelli lashed out on Sunday night after again being targeted by racist insults, this time from Lazio fans after he scored for Brescia in a 2-1 Serie A home defeat.
The 16-time Grand Slam victor saved nine break points to get past Gael Monfils 6-3, 6-2, before stepping back on the court with partner Viktor Troicki to take on Nicolas Mahut and Edouard Roger-Vasselin in the doubles. On the next point he furiously admonished the crowd for a disturbance during a rally.
"You actually are the first player to be World No. 1 in three different decades. what is the secret?". "I played a very solid match, my serve worked better than the first day".
Next up on Rac Arena was the match between World No. 1 Nadal and World No. 45 Pablo Cuevas.
Every ace hit at the tournament will see Aus$100 (Aus$69) donated to victims, while several players have individually pledged more.
Lastly, in the doubles rubber, Pablo Carreno Busta and Feliciano Lopez managed to seal a hard-fought victory over Ariel Behar and Juan Martin Fumeaux, winning 6-1,3-6 [10-3] to complete the flawless day at the office for Spain.