Yorkshire left-arm fast bowler David Lucas virtually guaranteed that his contract will be extended to the end of the season by capturing six wickets for 20 runs on his first-team debut against Leeds-Bradford Universities at Headingley yesterday.

Australian paceman Adam Warren, who is having trials with Yorkshire, also impressed director of cricket David Byas by grabbing two wickets with his first seven deliveries for the county as the Universities began their slide to 105 all out.

But Yorkshire did not have everything their own way on a day in which 23 wickets crashed in helpful swing

conditions and they were bowled out for 151, the Universities then closing their second innings on 12 for three when they trailed by 34 runs.

Lucas, 26, was signed from Notting-hamshire during the close season on a three-month contract, which is due to be reviewed at the end of this month, and Byas admitted he had been pleased by his performance and that of Warren.

"They both put the ball in the right areas and were well rewarded for their efforts," he said.

Lucas added: "The ball was a bit

slippery at the start of my spell but it was swinging quite a lot in the humid conditions and that helped me.

"I was delighted to take six wickets but I think I have been bowling well all season for the second XI and I was just glad of the opportunity to play in this match.

"I think I have been bowling well enough to deserve an extension to my contract but I will just have to wait and see what happens over the next few weeks.

"Whatever the outcome, I have really enjoyed myself at Yorkshire and I am very grateful for all the help I have received from bowling coach Steve Oldham, who has been fantastic."

Warren, who plays for Bootle in the Lancashire Premier competition, said: "It was great to get two wickets with my first seven balls and this helped to relax me, although I am 29 now and not overly nervous.

"The pitch was helpful, which is why we chose to bowl first, and I would like to think that I can go on and gain a

contract with Yorkshire.

"I played a few games for Derbyshire seconds last year and was due to join Yorkshire later in the season, but I got a bad blood infection in my leg after being struck by the ball and this put me out of action for a while."

Leeds-Bradford opening batsmen Adam Patel, who plays for Cleckheaton, and Gharib Nawaz, who is with Saltaire, set off at a cracking pace against Chris Silverwood and John Blain with 44 runs coming off the first nine overs.

Then Warren came on at the Kirkstall Lane end and had Patel caught behind from his fifth delivery.

The second ball of his next over trapped Nawaz lbw offering no stroke and when Lucas came on the batting disintegrated completely.

Lucas also struck with his fifth ball, Jos Siddall presenting wicketkeeper Simon Guy with the second of his three catches, and he later found himself attempting a hat-trick but was denied by Qasim Ali.

None of Yorkshire's main batsmen really stood out against a youthful and enthusiastic Universities attack, the most successful bowlers being Tom Glover and Danny Jones who each bagged three wickets.

But Yorkshire's 46-run lead after the first day had been washed out was

more than useful and the chances of the students making a big recovery were dashed as the wickets continued to

topple in their second innings.