Watson's patient 101 came off 279 balls and included eight boundaries.
There was some drama as well when Australian skipper Ricky Ponting had a heated exchange with Zaheer after being run out and required the umpire' intervention.
Save for Zaheer (3/45), who got the ball to move both ways including generating a fair amount of reverse swing at the fag end of the day, the other Indian bowlers failed to make an impression on a difficult pitch where stroke-making wasn't that easy.
Zaheer's effort was all the more laudable as his new-ball partner Ishant Sharma broke down with a hamstring pain after bowling only 7.4 overs, including eight no-balls.
Text: PTI
Images: AP