Joe Clarke's century helped Nottinghamshire reach 305/6 on the first day of the Vitality County Championship contest against Worcestershire.
Clarke, who scored his second consecutive hundred, partnered with Ben Slater (70) to form a crucial 133-run partnership and weather an early storm.
Lyndon James and Calvin Harrison formed a crucial seventh-wicket partnership to secure a strong position for the hosts at the end of the opening day.
Despite losing skipper Haseeb Hameed and opener Ben Duckett early on to Nathan Smith - the former was bowled and the latter was caught behind by Gareth Roderick - Slater and Clarke aimed to rally the hosts at 34/2 and establish a substantial score before lunch.
They added 49 runs before the end of the session. Slater scored his first half-century of the season after the resumption of play.
Joe Clarke also reached his half-century in style, scoring 25 runs from just 11 deliveries. This adds to his strong start to the campaign.
Slater scored 70 runs before being dismissed, caught down the leg side by Roderick off Adam Finch's delivery.
Matthew Montgomery scored 11 runs before being caught by Jason Holder in the slips. Jack Haynes joined Clarke in the middle before tea.
Clarke had to wait until after the second break to complete consecutive centuries, hitting the boundary 12 times - including three sixes - on the way to a crucial hundred as one of the early leading run-scorers in the County Championship.
Joe Leach dismissed his former team-mate Jack Haynes for 15 after striking his pad. Notts added six more runs before Clarke was caught by Roderick for Josh Baker's first wicket, ending his stint on 105.
After Clarke was dismissed, the visitors were motivated, but the Green and Golds did not give up. Lyndon James and Calvin Harrison provided strong resistance with a 67-run seventh-wicket partnership, which saw out the remainder of the evening session.
This left the hosts in a healthy position, and Notts reached 300 runs before the end of day one, posting 305/6 at stumps. James (39*) and Harrison (25*) will look to add more runs in the morning of day two (11 am start).