Surrey Stars 135 for 4 (Beaumont 47) beat Yorkshire Diamonds 134 for 5 (Armitage 43) by six wickets
Tammy Beaumont and Nat Sciver displayed all of their international experience in steering Surrey Stars to their first Kia Super League victory, chasing down the 135 set for them by Yorkshire Diamonds with six wickets in hand and 11 balls to spare.
In front of 2250 people at The Oval, England opener Beaumont compiled an assured 47, contributing to stands of 65 for the first wicket with Bryony Smith and 57 for the third with Sciver, who was unbeaten on 29 when clobbering the winning runs behind square leg.
Earlier, Alex Hartley was crucial with the ball. The visitors had gotten off to a flyer, 72 without loss at the half way mark with Hollie Armitage and Lauren Winfield batting with ease. It was the left-arm spinner who removed them both in the space of three balls, Winfield caught and bowled for 29 then Armitage bowled for 43.
It was the catalyst for an excellent second ten overs for the hosts, restricting the Diamonds to 5 for 62 in that period. Hartley was the clear stand out with 2 for 18 from her four overs without conceding a single boundary, while seamers Sciver and Rene Farrell bowled with considerable control at the death of the innings.
Surrey's fielding also improved dramatically, after twice dropping early chances Sciver executed a superb direct hit run out of dangerous Australian Beth Mooney, her throw released in one motion after completing a diving stop.
In reply, Surrey's innings followed in a similar fashion to the first, the openers able to see off the initial threat from England spearhead Katherine Brunt before 19-year-old Smith took the quick for three consecutive boundaries in the fifth over to turbocharge the chase.
Her 50 stand with Beaumont was raised in 35 balls, and the score was 65 before Yorkshire made their first breakthrough when Smith was deceived one of Jenny Gunn's myriad slower balls, a top edge taken at short third man.
A sharp stumping from Mooney, also off the bowling of Gunn, removed No. 3 Cordelia Griffith shortly thereafter, bringing Sciver to the crease to join Beaumont with a further 62 needed at just under a run a ball.
But it was the pace of Brunt that again helped the batting side when it mattered most, 13 taken from the 14th over (including three wides) to take Surrey score beyond 100, making the final result a relative formality.
After the hard work was done Beaumont holed out with five required for victory, appropriate reward for offspinner Steph Butler who impressed in her first game of the tournament.
With two losses to start the start their season, Yorkshire now have no margin for error. Their next fixture is at Southampton on Monday against the Southern Vipers.
Meanwhile for the winners, after squaring their ledger at one and one they play the Western Storm on Sunday at Bristol.