New Delhi: Harbhajan Singh's lackluster performance in the first cricket Test against Sri Lanka has put him under pressure and former India tweaker Venkatapathi Raju feels the veteran off-spinner's poor form is the result of trying "too hard" to prove his worth on comeback.

In a match dominated by spin, Harbhajan picked just one wicket in his 25 overs during the course of two innings as India lost by 63 runs to go 1-0 up in the three-match series. "He went through that rehabilitation phase while correcting his action. Then he was out of contention for a while and now when he has made a comeback, he is probably trying too hard. (But) There is nothing lacking on the experience front. He knows what to do in which condition," Raju told PTI in an interview.