Sean Williams' maiden test century went in vain as New Zealand clinched a comprehensive innings and 117-run victory over hosts Zimbabwe on day four of the first test at Bulawayo today.Williams scored the quickest test ton by a Zimbabwean off 106 balls before becoming the ninth man out for 119 having smashed 21 fours.Zimbabwe were dismissed shortly before tea in their second innings for 295, with seamer Trent Boult the pick of the visiting bowlers as he picked up four wickets on a flat batting track. They were all out for 164 runs in their first innings.New Zealand amassed 576 for 6 declared in their first innings, with Ross Taylor (173 not out), Watling (107) and Tom Latham (105) all reaching three figures.