Bucks finished bottom of Group 4 in the National Counties T20 Championship when they lost their final two games to Wales NC at High Wycombe on Sunday.
The results mean that Bucks lost seven of their eight matches in the competition, although two of them by very narrow margins.
In the first match of their double-header, Bucks inserted Wales and bowled them out for 161 in 19.2 overs, Morgan Bevans top-scoring for the visitors with 62, with the wickets being evenly shared by the Bucks attack.
But the hosts, despite a rapid 40 from 25 balls by Alexei Kervezee, managed only 141-9 in reply, Jason Foulkes restricting them with 3-18.
In the second game, Wales chose to bat first and rattled up 191-4 from 20 overs, after an opening stand of 143 between Tom Bevan (78) and Connor Brown (72).
In a thrilling run chase, Bucks replied with 188-3 to lose by just three runs. Conrad Louth (57no) and Eliot Callis (57) gave them a great start, but despite a sparkling unbeaten 45 from 28 balls by Ross Richardson, Bucks fell just short.
Three counties were level on points at the top of the group, with Oxfordshire going through to the semi-finals on nett run rate. They will be joined by other group winners Cambridgeshire, Dorset and Cheshire on  finals day at Tring Park on Sunday May 22.
NATIONAL COUNTIES T20 CHAMPIONSHIP
GROUP 2 FINAL TABLE
                                 P    W  L  NRR  Pts
Oxfordshire                8      5  3   0.23  10
Bedfordshire               8      5  3   0.21  10
Berkshire                      8     5  3   0.01  10
Wales NC                      8      4  4   0.11    8
Bucks                           8     1  7  -0.62    2

Game 1 Scorecard

Game 2 Scorecard
Bucks now turn their attention to the annual Nurton York Cup match against Oxfordshire to be played at Beaconsfield this Sunday. This is the first time Bucks have staged a representative game at Wilton Park for nearly 20 years.
The 50-over contest, which starts at 11am, acts as a warm-up for Bucks's forthcoming matches in the National Counties Trophy.
Bucks have brought in a number of younger players in a side which be captained by former Wocresterhire all-rounder Alexei Kervezee.
Bucks squad: A Kervezee (Halesowen) capt, C Marrow (Gerrards Cross), D Ogden (Harefield), M Critchley (Great Brickhill), J Tarling (Buckingham), E Bragg (Halesowen), J Rodnight (Great Brickhill), S Croft (Harefield), M Choudhry (Tring Park), J Denning (Gerrards Cross), J McLeod (Harefield), T Flemming (Gerrards Cross).