SAN FRANCISCO: Tiger Woods loves to be part of the Presidents Cup but the world No 1 said on Tuesday that no matter how well he plays, some people are just never satisfied.

After sitting out last year's Ryder Cup to recover from knee surgery, a revved-up Woods is back leading the heavily-favored Americans this week at Harding Park in their campaign for a third straight win.

Woods has played in five of the biennial events, losing one, tying one and winning three but believes people have expected better from the world's first $1 billion athlete.