Harlequins remain unbeaten at the top of the Aviva Premiership table, following a narrow 21-18 win over Leicester at Welford Road.
Boris Stankovich's early try put the Tigers ahead after two minutes, before Sam Smith responded to tie the score inside five minutes.
However, Nick Evans's three points meant that Harlequins held on to their lead at the break.
The Quins fly-half added his second penalty of the game after 10 minutes of second-half action.
Staunton responded almost instantly to put the home side just two points behind, but a Joe Marler try after 70 minutes put the game all but out of reach for the Tigers.