Ben Brown shared a club-record sixth-wicket stand with Sussex teammate Luke Wright in their County Championship match with Durham.
Brown finished on 152 not out after day one on at Hove Sunday, while Wright ended the day not out on 182.
Rain delayed the restart on Monday morning but both were quick into the action as Wright added seven more runs before being caught by Phil Mustard off the bowling of Chris Rushworth, to fall agonisingly short of a double century.
Brown got himself to 163 before falling victim to the bowling of Mark Wood but surpassed his previous best score of 112 with ease.
The 352 run partnership is the club’s highest ever sixth-wicket stand in its 175 year history and is another feather in the cap for Brown.
The former Eastbourne wicket keeper,25, has firmly established himself in the Sussex first team and has kept England regular Matt Prior from behind the stumps on numerous occasions.
He is currently vying for the position with Eastbourne’s 19-year-old Callum Jackson, who was twelfth man.
It might have been a different story on the day, however, as both Brown and Wright were lucky to be the benefactors of dropped catches when on 47 and 83 respectively.
But as the pair rallied, they managed to put their team in a position to claim a draw against the reigning champions, although they’ll be frustrated with the weather after putting themselves in a commanding position,
Shortly after their wickets fell, Sussex decided to declare on 505.
They made an early breakthrough when Mark Stoneham was caught behind inside two overs and Keaton Jennings was run out by team-mate Scott Borthwick.
Borthwick made amends with the bat, though, to reach 84 not out .
After a good start, Sussex stay third in the County Championship and will look to build on that at Middlesex on May 26.