The answer is 2. It can be done by dividing them into groups of 3, 3 and 2.
First Weighing: Both groups of 3 balls each.
Possibility 1: One of them is heavier
Second Weighing: Take any two balls from the heavier group and weigh them.
Possibility 1.1: One of them heavier. That is the one.
Possibility 1.2: Both are equal. The third one is the heaviest one.
Possibility 2: Both groups of 3 balls each are equal in weight.
Second weighing: The remaining 2 balls in the third group. One of them would surely be heavier!
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