We're down to the quarter-finals of this year's William Hill Greyhound Derby and Racing Post Greyhound TV's Jonathan Kay is once again on hand to preview the action.He joins Mark Walton to look ahead to all four of Tuesday's quarters as well as the four supporting televised races.Jonathan offers up his tricast predictions in each and also tells us who he likes in the Outright market.Enjoy.http://serve.williamhill.com/promoRedirect?member=audiobooUK&campaign=DEFAULT&channel=will_horse&zone=1474273946&lp=0