DAY ONE: Hampshire closed on 25-0 (Brown 10*, Adams 10*) after bowling Yorkshire out for 299.

Toss: Yorkshire

Stuart Clark was involved in the key dismissals of Michael Vaughan and Jacques Rudolph after being handed a surprise Hampshire debut this morning.

Clark was not expected to play his first game until the Bank Holiday Monday fixture against Ireland at the earliest.

But he arrived in Southampton yesterday and after Cricket Australia gave him permission to play he took the new ball this morning -just four days after Australia's World Cup triumph.

Clark's inclusion was one of two changes to the side that beat Surrey. He was preferred to Chris Tremlett, who made his comeback from a back injury in the Friends Provident Trophy on Sunday, to replace Shaun Udal (ankle).

And Sean Ervine replaced Dimitri Mascarenhas (knee) for his first appearance of the season after recovering from a shin injury.

Yorkshire included England pair Michael Vaughan and Matthew Hoggard in their side, and there were also returns from injury/illness for Jason Gillespie and Anthony McGrath.

Clark, bowling from the Northern End, looked fresh after playing in just one World Cup game and finished his first spell for the county with figures of 7-1-24-0.

The 31-year-old took 26 England wickets at just 17.03 during the Ashes series but is playing only his second game against Vaughan, who missed the tour of Australia with a knee injury.

In their last meeting, Clark dismissed Vaughan while playing for Australia A as an England XI warmed up for the 2002-03 Ashes series in Hobart - the most prolific series of the England captain's career.

Vaughan, desperate for runs ahead of the first Test against the West Indies on May 17, looked in good touch in his first first-class appearance for 11 months.

But Hampshire just failed to run him out on 2, when the England captain scrambled back into his crease as an under-arm, side-on throw from Chris Benham at point missed the stumps.

Vaughan's left-handed opening partner Joe Sayers (17), a match-winning centurion against Durham last week, was caught in the 22nd over of the morning, Ervine's second, after nudging the Zimbabwean's medium pace to his former teammate Michael Lumb at mid-wicket (57-1).

But Vaughan looked determined to make a big total as he drove James Tomlinson to the extra cover boundary to reach his fifty from 87 balls with the seventh of his 11 fours.

Shane Warne responded by bringing himself on to bowl the next over and the last before lunch, the 32nd, from the Pavilion End.

He did not take long to make an impact. A venomous appeal followed his third delivery of the match and Anthony McGrath (7)was given out, caught by Michael Brown at forward short leg, after prodding forward to the Hampshire captain (77-2).

LUNCH

Debutant Clark helped Hampshire take two prize wickets in 15 overs during the second session.

Vaughan (72 from 123 balls)was comfortably run out in the 14th over of the afternoon session as he tried to scamper a quick single after playing a Shane Warne delivery to Clark at mid on.

He was sent back by Younis Khan and Clark and Nic Pothas ensured that Hampshire would not miss a second chance to run out the England skipper (134-3).

It got even better for Hampshire when Clark took his first Hampshire wicket in the first over of his four-over second spell - having Jacques Rudolph caught down the leg side (149-4).

Younis Khan reached his first fifty for Yorkshire from 72 balls, but in the 61st over Hampshire struck again when James Bruce found the outside edge of Gerard Brophy's forward defensive prod (183-5).

TEA

Yorkshire dominated the opening exchanges of the evening session with a Rose Bowl crowd approaching 2,000 still bathing in glorious sunshine.

Younis Khan put on fifty for the sixth wicket with England U19 international Adil Rashid before reaching his hundred from just 136 balls (14 fours).

But the day swung firmly in Hampshire's favour when Bruce and Tomlinson took the last five Yorkshire wickets for 17 runs in just 53 deliveries with the new ball.

Rashid had struck Tomlinson for three successive fours before reaching his fifty (84 balls, five fours) in the first over with the new pill, when he drove Bruce for three runs.

But with his next delivery Bruce claimed his second wicket of the innings by trapping Younis Khan (106 from 151 balls) lbw on the back foot (282-6).

It ended a 99-run partnership for the sixth wicket and in the next over Rashid (54) followed Yorkshire's centurion into the pavilion after pulling James Tomlinson down the throat of Bruce at long leg (284-7).

Bruce took two wickets in three balls in the next over.

A sensational catch in the slips accounted for Jason Gillespie and swung the day back in Hampshire's favour.

Bruce found Gillespie's outside edge and second-slip Warne, while diving at full stretch to his right, parried the ball to Chris Benham, who took the catch at third slip (289-8).

Two balls later, Bruce sent Darren Gough's middle stump cartwheeling to dismiss the Yorkshire captain afterhe had edged a four over the slip cordon (293-9).

Clark then brought back memories of the last Ashes series when he consistently beat Matthew Hoggard's outside edge in the first and only over of his third spell.

But Hampshire denied Yorkshire a third batting point when Warne held onto a juggled effort at second slip to hand Tomlinson the wicket of Tim Bresnan and leave Hoggard four not out.

Hampshire bowling: Clark 12-3-37-1, Bruce: 20-2-56-4, Tomlinson 20.4-2-68-2, Ervine 14-3-42-1, Warne 18-1-63-1, Adams 9-2-25-0