James Coles took the final wicket as Sussex completed victory at Hove Rothesay County Championship, Division One, County Ground, Hove (day three).

Glamorgan 155 & 268: Tribe 64, Kellaway 55; Haines 3-5, Coles 3-34.

Sussex 521: Coles 224*, Hughes 72, Haines 48; Norton 3-119.

Sussex (23pts) beat Glamorgan (2pts) by an innings and 98 runs, moving to the top of County Championship Division One with their fourth victory in seven matches.

Tom Haines, captain in the absence of England's Ollie Robinson, led the way with three wickets for just five runs with his tight medium pace, but there were also three for James Coles and two for Dom Goodman on debut after being called up to replace England-bound Henry Crocombe during the match.

Determined Glamorgan batting frustrated the Sussex bowlers for much of the day, but the visiting side lost two wickets just before lunch and three more shortly after tea, sealing their fate.

Glamorgan resumed on 42 without loss, still 324 runs behind, perhaps inspired by memories of their second innings score of 737 to save the match here three years ago after trailing by 358 on the first innings.

Openers Zain-ul-Hassan and Asa Tribe batted with tremendous resilience against a wide variety of Sussex bowlers. Tribe reached fifty from 98 deliveries when he worked Jack Carson through midwicket for his sixth four.

The hundred came up in the 35th over and ul-Hassan had scored just 25 at that stage. Ten minutes before lunch, Haines chucked the ball to spinner Coles, and the move worked as ul-Hassan clipped his second ball firmly off his toes, only to see Tom Alsop, at short-leg, pull off a fine reflex catch.

Three overs later, the last before lunch, Glamorgan lost their second wicket when Tribe was bowled by Carson with one that spun sharply. That last over before the break was somewhat surprising as the clock appeared to be showing 1.00pm when the umpires allowed another over.

In an attritional afternoon session, Glamorgan scored 92 runs for the loss of one wicket when Ben Kellaway, who had hit seven fours in his 55, was leg before, half-forward, to one that moved in from Haines.

At 212-3 at tea, Glamorgan could have felt proud of their rearguard action, but from the last ball of the first over after the break Colin Ingram edged Haines to Alsop at first slip for a pair. Two overs later, Kiran Carlson was run out for 32 by Dom Goodman at square-leg, slipping after being sent back by Sean Dickson.

And it was three wickets in four overs when Dickson, playing at a wide delivery from Haines, was caught by Jack Leaning at second slip. A stand of 42 for the seventh wicket was ended when Chris Cooke, who had been caught off a no-ball and dropped at slip, was lbw to Coles.

Goodman took his first wickets for Sussex when he had Tom van der Gugten and Tom Norton caught behind in the same over before Coles - who made a double century on day two - finished the game by bowling last man Ryan Hadley.

Report by ECB Reporters' Network, supported by Rothesay.

Tom Haines, Sussex captain: "I'm very happy. Glamorgan are a good team. They've come up and shocked a few big teams. We knew we were in for a scrap. But we got ahead in the game. It was a big toss for us. But we still had to do the job, and that's what we did. We've now got an extra day off for the bowlers before the Hampshire game at the end of the week.

"Simmo [John Simpson] hasn't bowled me much in the past two years, but Robbo has bowled me a bit more this year. It was a team performance, though. Jaydev [Unadkat] bowled 20 overs of first-class stuff and didn't take a wicket in the second innings."

Richard Dawson, Glamorgan head coach: "We've underperformed. Sussex put us under pressure throughout the game. We scored a couple of fifties here and there and had a few partnerships, but we didn't go big enough. We know that. When we've won games this season, we've put together big partnerships and done it consistently. But we haven't done that this week.

"The toss was important. It was tricky on the first day. But Sussex have a good attack for all conditions. Two good spinners. Good seam bowlers, left arm right arm. We knew it was going to be a challenge, and it was."