Worcestershire 410 (Libby 198, Karvelas 4-54) and 381 for 8 (Azhar 100, Libby 97, Karvelas 3-60, McAndrew 3-76) drew with Sussex 348 (Carter 76, McAndrew 65, Carson 64, Leach 6-78) and 359 for 6 (Alsop 100*, Haines 91, Carson 75, Hudson-Prentice 54, Clark 50)
Worcestershire nearly pulled off a perfectly-paced run chase only to fall five runs short of their target in a thriller against Sussex at Hove.
Set 386 in 78 overs at 4.94 runs an over, Azhar Ali made 100 and Jake Libby followed his first-innings 198 with 97 and they looked on course for victory with Ali still there and 16 needed off the last two overs with four wickets in hand.
But three balls after reaching his century with a leg glance which brought him a 15th boundary Ali was yorked by Ari Karvelas. Usman Mir was superbly caught at mid-wicket by Sussex captain Tom Alsop off the first ball of the final over when Worcestershire needed eight to win.
Australian Nathan McAndrew only conceded three off the next five balls leaving Joe Leach the opportunity to win the game with a six off the last delivery, but he failed to connect and the contest between second and third in Division Two of the LV= County Championship ended in a draw with Worcestershire closing on 381 for 8.
Alsop, who had earlier completed an unbeaten hundred, deserved credit for maintaining attacking fields until near the end and his bowlers kept plugging away on an unresponsive surface at the 1st Central County Ground. But having got so close Ali will be disappointed that his century wasn't enough to get his team over the line.
Alsop had earlier gone to his second hundred of the season before Sussex declared after an hour's batting once they added 88 in 15 overs.
Alsop, who is leading Sussex for the next four Championship games in the absence of Cheteshwar Pujara, wasn't at his most fluent but it was a valuable contribution given that he came in on the second day and watched four wickets go down at the other end in ten overs. He extended the seventh wicket stand with Jack Carson to 150 of which Carson contributed a well-constructed 75 with eight fours and three sixes, his second half-century of the match.
Carson was run out coming back for a second, beaten by Ali's throw from deep mid-wicket, but Henry Shipley added a rapid 28 from 16 balls including successive sixes off Mir before Alsop took a single off the Pakistan leg-spinner to reach the ninth hundred of his career, made in five hours with ten fours.
Worcestershire launched their run chase confidently enough, Libby and Gareth Roderick scoring at the required rate before Karvelas broke the partnership on 74 in the fourth over after lunch with a ball which straightened enough to beat his defensive stroke.
Libby would have been run out had Shipley hit the stumps with a throw from mid-wicket when he was on 69 while he seemed to relish some peppery verbal exchanges with McAndrew, who was warned for running down the wicket during a six-over spell.
But Libby slowed up as he approached three figures and he fell agonisingly short. With his fourth ball after switching ends Carson found a modicum of turn and the edge deflected off keeper Oli Carter's gloves into Alsop's hands at slip. He hit 14 fours and a six off 132 deliveries, adding 93 in 22 overs with Ali.
Jack Haynes contributed 44 to a third-wicket alliance of 94 in 18 overs until he was leg before trying to work McAndrew through square. Adam Hose then upped the tempo by taking 15 off a Carson over as he struck 47 off 40 balls before thick-edging behind off Fynn Hudson-Prentice.
McAndrew picked up Brett D'Oliveira, who chipped to mid-wicket, but Matthew Waite wielded the long handle effectively with 18 off 11 balls and he appeared to be putting his side in the driving seat only to hole out to deep mid-wicket. Ali did his best, but McAndrew and Karvelas bowled outstandingly under pressure at the end.