Wawrinka is back in the city to complete a hat-trick and follow it up with more Grand Slam success like in previous years.
The fifth-seeded Stan Wawrinka won 6-4, 1-6, 6-3, 6-4 on Monday.
Top seed Stanislas Wawrinka defeated Aljaz Bedene with ease to win his third Chennai Open title.
India’s Somdev Devvarman and Ramkumar Ramanathan also figure in the main draw of the Chennai-based tournament.
Near the end of the match, it had appeared Wawrinka was unhappy with the exuberance of the celebrations of Federer’s camp, led by his wife Mirka.
The 36-year-old Haas produced some inspirational tennis to frustrate Wawrinka.
Stanislas Wawrinka loses to Austrian qualifier Dominic Thiem 1-6 6-2 6-4 in second round.
Australian Open champion Wawrinka recovered from opening set loss to claim maiden Masters title.
Holder Djokovic resisted for one set before pain in his right wrist was just too much to bear.
Nadal thrashed Italy’s Andreas Seppi 6-1 6-3 while fourth seed Federer defeated Czech Lukas Rosol 6-4 6-1.
Like Switzerland, Italy and France also trailed 2-1 in their quarterfinals going into the final day.
Switzerland last reached a Davis Cup semi 11 years ago, when Federer lost a key five-setter against Australia’s Lleyton Hewitt.
Nadal looked more comfortable in the final and improved his record on clay to 298 wins and 21 losses, the best in the Open Era.
The Spaniard Rafael Nadal declined to talk about his back, focusing instead on the victory.
Federer beat Ilija Bozoljac in straight sets while Wawrinka, fresh from winning his maiden grand slam title at the Australian Open.