Ryan ten Doeschate and Hamish Rutherford produced a record partnership as Essex thrashed Scotland by 125 runs in their Yorkshire Bank 40 Group B match at Chelmsford.
The home side reached 368-7 to record their highest 40 overs total before their opponents responded with 243-8.
Ten Doeschate thrashed his way to 180, his best limited-overs score for the county, while New Zealand international Rutherford powered his way to 110 on his Essex debut with the pair posting 230 in 22.1 overs, a new county record for the fourth wicket in List A matches.
The pair slaughtered the Scotland attack during an innings which totalled 23 sixes and 23 fours. Rutherford launched his Essex career with a wonderful display of clean and powerful hitting, facing just 88 balls which included six sixes and nine fours, while ten Doeschate was typically aggressive.
His century arrived from 72 balls with six sixes and five fours and when Michael Leask bowled him 26 balls later, his innings boasted 23 boundaries of which 15 cleared the ropes.
Having put their hosts into bat, Scotland started well. Calum MacLeod removed Tom Westley (0) with the fourth ball of the match while Owais Shah, making his first appearance after his stint in the Indian Premier League, was also dismissed for a duck after Mark Pettini had been caught for 23.
At that stage the Eagles were 49-3 in the 11th over but that was the final cause for celebration for the Saltires bowlers, who were treated with disdain thereafter.
The home side then retained their vice-like grip on the match when they took the first four Scotland wickets inside the opening 10 overs of the reply at a cost of 55 runs.
Skipper Preston Mommsen (42) joined Ewan Chalmers (34) in a well-constructed 64-run partnership before man-of-the-match ten Doeschate got involved once more.
He removed both batsmen in successive overs leaving the visitors on 124-6 and then ended a 39-run stand for the seventh wicket when he ran out Moneeb Iqbal (30).
Matthew Cross then secured a modicum of respectability for his side with an unbeaten 54 in an unbroken partnership of 72 with Calvin Burnett (31 not out) but Scotland finished well adrift of their target.