South Africa were brilliant with both bat and ball as they claimed the five-match T20 International series with a 25-run win over West Indies in the final match held at the National Cricket Stadium in Grenada.
Shamsi recorded figures of 1-11 in four overs to stall the West Indies victory charge as the hosts attempted to chase down South Africa's score of 168 for four but were restricted to 143 for nine as the tourists claimed the series 3-2.
Apart from losing captain Temba Bavuma for a duck on the third ball of the contest, South Africa were rarely troubled after winning the toss.
The ever-reliable Quinton de Kock (60) and Aiden Markram (70) produced the biggest partnership of the match, not to mention the two highest scores, as they combined for 128 runs to put the Proteas on the front foot.
The South Africa duo surged through the middle overs with de Kock bringing up his third consecutive half-century of the series before helping his team to 168/4 after 20 overs.
Evin Lewis (52 from 34) gave West Indies a fast start to their chase, but the remainder of the batting line-up struggled to score at his rate and they soon fell off the pace, leaving too much to do in the final few overs.
Seamer Lungi Ngidi saved his best performance for the last game in the series as he recorded figures of 3-32.
It's South Africa's first T20I series victory since March 2019 with the Proteas adding to their Test series win in the Caribbean last month.
3rd T20I (N), Colombo (RPS),29 Jul2021
2nd T20I (N), Colombo (RPS), 28 Jul 2021
1st T20I, Bridgetown, 28 Jul 2021
3rd ODI (D/N), Barbados, 26 Jul 2021