Paes, who is in the reserve team for the Davis Cup, trained for nearly three hours in the morning in the company of a couple of junior players and coach Zeeshan Ali.
The 43-year-old worked on his serve, backhand returns and forehand shots as he sweated it out at the KSLTA hard courts here.
"Oh, it feels so great," Paes said during one of the breaks at the practice session.
Paes arrived in the city last evening from Mexico amidst non-playing captain Mahesh Bhupathi refusing to reveal the doubles combination for the Davis Cup tie against Uzbekistan.
Paes flew in from Leon, where he won his first Challenger title of the season, bagging the doubles title in the USD 75,000 Challenger Tennis Tournament on April 1.
Paes and his partner Adil Shamasdin of Canada outplayed Luca Margaroli of Switzerland and Brazil's Calo Zamperi 6-1 6-4 in the final.