A dominant all-round performance by Mohammad Hafeez steered Pakistan to a six-wicket win over Sri Lanka in the first one-day international in Dambulla on Saturday. The off-spinner shrugged off concerns about his bowling action to grab four wickets. Electing to field after winning the toss, Pakistan kept Sri Lanka down to 255 for 8 in 50 overs. Hafeez then hammered a stroke-filled 103 to lead the tourists past the target in 45.2 overs, giving them the lead in the five-match series. It was his 10th one-day century.Ninth-ranked Pakistan need to win the series to stay in contention for a place in the eight-nation Champions Trophy in England in 2017. Sri Lanka, currently ranked fifth, are assured of taking part in the tournament. Pakistan had won the Test series 2-1 with a seven-wicket win in the final Test in Pallekele on Tuesday. The second one-dayer will be played in Pallekele on Wednesday.The final scores: Sri Lanka – 255 for 8 in 50 overs. Pakistan – 259 for 4 in 45.2 overs.