He struck two more sixes and a four before Rickelton joined in on the boundary spree as they raced to 58 for no loss after 25 balls.
The Fire clawed their way back into the contest once the field spread, with Woakes eventually dismissing Rickelton to end the 89-run opening stand.
Zak Crawley’s 12-ball 34-run blitz, which included four sixes and a four, reinfused momentum and the Sunrisers finished strong with Dan Lawrence and Matthew Revis adding to the boundary count at the death.
Marsh began by bludgeoning Chris Woakes for a six and followed it up with two boundaries.
Harry Brook started brightly with two sixes and two fours, but the Fire removed both him and Marsh, who had just reached his fifty, in quick succession.
In response, Fire did not get the kind of start they needed to chase a daunting 202-run target.
The bowling was tight and, barring a few boundaries, Fire’s openers struggled to find the gaps.
Phil Salt was dismissed for a scratchy 13 off 14 and the team only managed 24 runs off the Powerplay.
Matt Short struck three fours off Abrar Ahmed followed by a six off Tom Lawes but Fire were unable to sustain the charge.
The 49-run stand between Short and Joe Root took 35 deliveries before Short fell attempting to up the tempo.
Root and Jordan Cox’s 26-run partnership proved to be the Fire’s last meaningful resistance.
Brief Scores: Sunrisers Leeds 201/4 in 100 balls (Mitchell Marsh 50, Ryan Rickelton 40; Chris Woakes 2-41) beat Welsh Fire 130/6 in 100 balls (Matthew Short 43; Brydon Carse 3-24, Nathan Ellis 2-18) by 71 runs.
