Young batsman James Vince will captain Hampshire in the T20 Blast this summer.
Vince, Hampshire's Player of the Year last season, had already been appointed vice-captain in the County Championship and the Royal London One-Day Cup.
Vince, 23, is being tipped as a genuine contender for the England squads in all formats this summer.
He said: "I'm looking forward to the challenge of captaining the side and it will be a very proud moment to lead the lads out in our first game. I'm lucky that we have a very talented squad and one that has already had a lot of success in the competition.
"I've played under some very good and successful captains who I've learnt a lot from so I will try and follow in their footsteps and hopefully we can have another enjoyable and successful T20 season."
Vince spent the winter with the England Performance Programme in Australia and the England Lions on their tour of Sri Lanka.
Director of Cricket Giles White said: "'James has impressed both on and off the pitch and this is a great opportunity for him. He has the respect of the group and thinks about the game well and for those reasons I am sure he will do an excellent job."
Jimmy Adams will captain Hampshire in the Championship and one-day cup. Dimitri Mascarenhas has skippered the T20 team in the past but he retired from county cricket at the end of last summer.