The Stephen Murdoch-captained Wellington beat table-topping CD in the opening round at Nelson Park, Napier, and have also beaten them in the HRV Cup Twenty20 match at McLean Park, Napier, thanks mostly to Ryder's shield centuries in both innings and a bolshy knock of 75 in the hit-and-giggle format.
Lamb said it was the first time he had taken Ryder's scalp.
"He's been a handful for clubs here and especially CD."
CD English import Peter Trego also took a wicket late in the day and contributed 59 runs, including four fours and two sixes, to CD's innings of 389 all out after the visitors resumed yesterday at 98-1.
In-form Carl Cachopa, out for a duck in the first dig, scored 90 after opener Jeet Raval provided a platform of 74 with How's 51 to set the Firebirds a run chase of 247 for victory.
Wellington opener Michael Papps, unbeaten on 19, will be the key wicket for CD today after he carved up a century. Night watchman Scott Kuggeleijn is at the other end on eight as they chase a sedate two runs an over.
"We can't count our chickens just yet because they still have guys who can bat so if we get two to three more wickets in the morning then it'll be a good start," Lamb said, adding the Stags had a "pretty good feeling".
CD batsmen were disappointed with their first-innings total.
Lamb said the team were giving a break to Black Caps fast bowler Adam Milne, who will remain with them while undergoing rehabilitation for an Achilles injury that neither New Zealand Cricket nor CD want to risk.