Niall O'Brien and Josh Cobb both hit centuries as Leicestershire Foxes launched their Yorkshire Bank 40 campaign in style with a 115-run victory over Gloucestershire Gladiators at Grace Road.
Cobb smashed 107 and O'Brien hit 104 in an opening partnership of 193 that was the cornerstone of the Foxes' total of 289.
It proved too much for the Gladiators, who never recovered from a nightmare start to their innings and were dismissed for 174, with Cobb following up his heroics with the bat by taking 3-34.
Cobb, the Foxes one-day captain, and O'Brien, on his one-day debut for the county, gave an electrifying display after the Gladiators won the toss and decided to field first.
They raced to a 50 partnership off 35 balls with O'Brien hitting five boundaries and Cobb four. By the end of the power play it was 63 without loss, and the runs continued to flow.
They pierced the field at will with O'Brien offering the only chance when he was dropped in the deep off Benny Howell on 86. He reached his century off 79 balls with a six and 12 fours before holing out to long off in the 27th over.
Cobb went to his century off 89 balls with eight fours and three sixes. But he too perished going for another big hit skying a catch off Ed Young.
The Gladiators made a dreadful start in reply, slumping to 44-5 in 10 overs with both Michael Klinger and Chris Dent run out by some sharp fielding from the Foxes.
Then Cobb came on to bowl his off-spin and capped a man of the match performance by taking the wickets of Ian Cockbain, Gareth Roderick and Will Gidman.
Robbie Williams also took 3-34 with the Foxes winning the game with 35 balls remaining.