LV= County Championship Division One, Ageas Bowl (day three)
Hampshire 308 & 330-3 dec: Gubbins 139*, Vince 63, Middleton 52; Wagner 2-56
Somerset 137 & 102-2: Dickson 63*, Umeed 21*
Somerset (3pts) need another 400 to beat Hampshire (5pts) with eight wickets standing
Nick Gubbins effortlessly struck his third County Championship century as Hampshire ground Somerset towards submission on day three at the Ageas Bowl.
Left-handed batter Gubbins gracefully hit an unbeaten 139 - his highest score for Hampshire since joining from Middlesex - to move past 900 runs in the Championship this season.
Together with Fletcha Middleton and James Vince's half-centuries, Gubbins led Hampshire to a 501-run lead having forced Somerset to wallow in the south-coast heat.
Facing a minimum of 128 overs to bat out, the visitors slumped to 38-2, but Sean Dickson's unbeaten 63 held them together.
They reached the close on 102-2, with 400 still required to win.
Hampshire's title ambitions had been ended by 11:00am following Surrey's victory over Warwickshire.
Openers Toby Albert and Middleton had tediously scored 45 runs in 23 overs the previous evening, but their lack of adventure paid dividends, having taken much of the lacquer off the ball.
They batted with more intent as they took their partnership to 80 with little fuss, with Middleton reaching his fourth fifty in his debut season.
They both fell within four overs of each other, Middleton bowled for 52 and Albert caught and bowled by New Zealander Neil Wagner, on his Somerset debut.
Gubbins had been slow in the first innings to take his seasonal strike rate to the third lowest in Division One - only Dom Sibley and Luke Proctor were slower for those who had scored more than 200 runs.
This time around he showed an attacking flair, taking part in a cover-drive battle with Vince as he reached 50 in 81 balls.
The 135 balls his subsequent century came in were the fastest of his six tons for Hampshire.
Lewis Gregory, although on the pitch, was not used at all on day three, while fellow opening bowler Jack Brooks only bowled five overs before the declaration.
As such, Gubbins and Vince - whose 50 came in 66 balls - found going easy with little pressure built to stop them from scoring at will.
Vince was caught behind to end a 162-run stand, but Tom Prest continued where he left off to continue the flow of runs with Gubbins - who is enjoying the second-best Championship season of his career.
The pair added 79 together before the long-awaited declaration came at tea.
Liam Dawson was the main worry for Somerset, with the occasional spin more threatening than pace. And it came to pass as the left-armer had Tom Lammonby stumped with his third delivery.
Tom Abell followed when James Fuller's extra pace was edged to second slip, where Vince took a sharp catch.
Dickson and Andrew Umeed showed tenacity and a backbone vital to save Hampshire from defeat. Dickson, in particular, looked in good order to reach his half-century in 86 balls.
Report supplied by ECB Reporters' Network.