Hewick justified Shark Hanlon's decision to bypass the Punchestown Gold Cup and also not defend his bet365 Gold Cup crown, as he took the Grade Two Oaksey Chase at Sandown under Rachael Blackmore.
The eight-year-old, who won the American Grand National Hurdle at Far Hills in October, was going well in front in the Cheltenham Gold Cup when he suffered a heavy fall when last seen.
Hanlon decided to swerve Punchestown as a result and his astute placement paid dividends - not that it was as easy the 6-5 favourite's odds would suggest.
Hewick was bowling along in front, pestered by First Flow, when he made a mistake early on the final circuit in the extended two-and-three-quarter-mile affair.
Blackmore had to be patient thereafter and it was not until three out that he got back on terms.
The 11-year-old First Flow still had an advantage in front under David Bass, yet Blackmore persisted and a scintillating jump at the last, where the pair came close together, saw the pair take over and Hewick's stamina kicked in. He ground out the victory margin to four lengths at the line.
Hugely popular staying chaser Kitty's Light shone once again in taking the bet365 Gold Cup.
Just seven days after landing the Scottish Grand National, the Christian Williams-trained seven-year-old, who was third to the well-handicapped Hewick in last year's renewal and was unfortunate the year before that, went one better after a protracted battle with Moroder.
In a deep renewal of the extended three-and-a-half-mile handicap, former King George VI Chase winner Frodon made much of the running, with Moroder upsides five out. But Bryony Frost's mount, shouldering top weight, was under pressure at the Pond Fence three out and as the 11-year-old back-peddled, Kitty's Light was making stealthy headway under Jack Tudor.
There were plenty still in with a chance two out, but the 11-4 favourite, who was carrying just 10st 8lb having escaped a penalty for last week's success at Ayr, powered up the hill and after jumping upsides at the final fence, strode out smartly to score by two and a half lengths from Moroder.
Revels Hill travelled smoothly only to be outgunned when it mattered and finished a further five and a half lengths down in third, with The Goffer making up ground to take fourth.
Having previously won the Eider at Newcastle, Kitty's Light completed a hat-trick and became the first horse since Hot Weld in 2007 to successfully complete the Scottish National and bet365 Gold Cup double.
Jonbon proved a point for Nicky Henderson, taking on and beating senior rivals over two miles in the bet365 Celebration Chase.
Sent off the 8-13 favourite for the Grade One feature, Aidan Coleman's mount, who was runner-up in the Arkle Challenge Trophy to El Fabiolo, had bounced back to score at Aintree on his previous start.
It was something of a surprise Henderson decided to run him again, given his busy back-end to the season, and in open company.
It was not all plain sailing for the brother of Douvan, however. Having led early against his four rivals, he made two jumping errors and was briefly shuffled back to last.
Coleman gave him plenty of time to get his act together and he was soon on the bridle again, and was back in contention by the Pond Fence, where Captain Guinness and Rachael Blackmore had asserted.
Beating off Greaneteen, who had won this race for the past two years, the pair had it to themselves over the last two fences, but Jonbon's stamina kicked in, and a superb jump at the last sealed the deal for the three-and-three-quarter-length winner.
