Kumble

he might have retired but with the ball in his hand he is competitive as usual
see these words for proof (from cricinfo)

Kumble roared even as he pumped up his arms into a furious arc. He reserves that only for the tensest moments and mostly when he has got rid of pesky big-hitters who have gone after him. It's a moment thoroughly relished by the most fiercely competitive bowler in Indian cricket history. It's also his way of offering tribute to the batsman - 'Thanks for trying to take me on, I enjoyed it. Do visit again'.

We have seen that when he took on Andrew Symonds in Australia. We witnessed it when he once removed Shahid Afridi. He later he joked about his reaction. "You have to do it; otherwise they will say you are too old for this format!"