​Somerset’s Craig Overton produced one of the great T20 Blast innings to help the defending champions pull off an astonishing victory at Yorkshire and reach Finals Day.Yorkshire, who were hunting their first T20 Blast title, reduced Somerset to 82-8 in the 15th over in chase of 162 at Headingley.AdvertisementAdvertisementAdvertisementBut Overton smashed 79 from 30 balls, including three sixes from the final over in which the visitors required 22 to win, to ensure Somerset qualified for the showpiece event for the sixth consecutive season.Notts Outlaws edged past Surrey by just seven runs in a thrilling finale at Trent Bridge that went to the final over.James Vince smashed 125 from 61 balls and Sonny Baker took 5-24 for three-time winners Hampshire, who cruised into the semi-finals with a crushing 75-run win over Essex at Utilita Bowl.And Ben Sanderson took 4-20 to help Northamptonshire Steelbacks see off Gloucestershire with an eight-wicket win to complete the last four.AdvertisementAdvertisementAdvertisementWednesday’s T20 Blast quarter-final scorecardsRelive Wednesday’s T20 Blast quarter-finalsCraig Overton had a strike rate of 263.33 [Getty Images]Somerset, who have won two of the past three T20 titles, looked down and out when they needed 80 runs from 27 balls to beat Yorkshire.The target of 162 set by the Tykes was the lowest in T20 matches at Headingley this season by 31 runs.Only Adam Lyth (64), with a third half-century of the campaign, had troubled the scorers for Yorkshire as Somerset’s bowlers shared the load – Jake Ball taking 3-30 and two wickets apiece for Riley Meredith (2-27), Daniel Sams (2-29) and Craig Overton (2-36).The hosts then tore into Somerset in their first meeting in this format, quickly reducing the holders to 28-4 in their sixth over.AdvertisementAdvertisementAdvertisementTom Banton, released by England to play the game, fell for just one, as did brothers Thomas and James Rew.Will Smeed (21), Tom Kohler-Cadmore (2), skipper Lewis Gregory (19) and Daniel Sams (0) soon followed to leave Somerset 59-7 and requiring 103 to win from eight overs.Overton then staged an almost unthinkable recovery, hitting eight fours and five sixes on the way to his first T20 Blast half-century, to inflict a painful defeat on Yorkshire, whose wait for a first title goes on.Olly Stone (second right) took two wickets in a tense final over for Notts in their win over Surrey [Getty Images]Surrey appeared to be on course for a routine victory when Jason Roy (76) and Laurie Evans (40) put on 100 for the first wicket after 12 overs in chase of the 164 target set by Notts Outlaws.AdvertisementAdvertisementAdvertisementBut Surrey, seeking a first T20 Blast title since 2003, lost three wickets in quick succession, leaving them needing another 41 from the final 26 balls at Trent Bridge.The visitors required 12 runs from the final over but Olly Stone (2-23) took two wickets to in a tense ending as Surrey’s last seven batters contributed just 39 runs.Bin