Sharif claimed four wickets as the Scots won their rain-affected match with Namibia by 21 runs at the Bert Sutcliffe Oval, Lincoln.
Resuming on 59-2 and needing 221 more runs for victory, the Namibians were on course after Craig Williams (57) and Nicolaas Scholtz (38) put on 80 for the fourth wicket. But Sharif produced a devastating burst of pace bowling to put Scotland back in charge. The Falkland bowler clean-bowled both men in the space of two overs and went on to finish with figure of four for 55 to leave Scotland second in the Super Six table.
"Namibia put a really good partnership together and we were struggling to get a breakthrough," said Mommsen. "But Sharif had a brilliant spell towards the back end and I think that's what won us the game."
Scotland had scored 279-9 on the first day with Matt Machan and Richie Berrington both hitting half-centuries and Mommsen is delighted with the contributions all his main batsmen have made. "Scoring enough runs has been a problem for us in the past but the guys have been doing brilliantly and making meaningful scores," he added.
The Scots will take another big stride towards qualification for next year's tournament if they can defeat Papua New Guinea this morning. PNG qualified for the Super Six stage as Group B winners, beating Namibia, Kenya and Uganda, while in Lega Siaka, the former Grange overseas amateur, they have one of the most dangerous batsmen in the tournament.
Their pace bowling attack is spearheaded by Willie Gavera who had a spell with Aberdeenshire in 2010.