Dean Morgan scored his third goal in as many games, but the Wanderers were eventually undone by two late goals as they lost 3-1 to Reading.
Blues more than matched their Championship opponents for the majority of a game played in searing heat, but efforts from Pavel Pogrebnyak and Danny Williams inside the final 15 minutes ensured victory for the Royals
Morgan looked sharp throughout and tried his luck inside the opening 60 seconds, but drilled wide left-footed after chesting the ball down into his path.
Stuart Lewis then linked up well with a trialist who flicked the ball into his path and the central midfielder fired just wide from the edge of the area.
Gareth Ainsworth’s side had started brightly with Lewis and Sam Wood in particular not giving their Championship opponents any time to settle.
Matt Ingram was called into the action for the first time in the 13th minute when Wayne Bridge found Jordan Obita and then latched on to the winger’s flick before shooting from 20 yards.
Reading took the lead two minutes later when Royston Drenthe’s 25-yard free-kick was well saved by Ingram, but Nick Blackman reacted quickest to hook the rebound against the bar, before Adam Le Fondre headed in from on the goalline.
Wanderers responded well and Anthony Stewart was denied an equaliser in the 25th minute by a fine save from Stuart Taylor.Wood won a free-kick wide on the left and Stewart rose highest to meet Matt Spring’s set-piece, but Taylor was equal to his powerful header.
Paris Cowan-Hall was inches wide five minutes before the break when he cut in from the right and aimed for the far corner after being picked out by Hause’s pinpoint crossfield pass.
Morgan then curled wide from just inside the area after picking up Wood’s pass and jinking inside Morrison as the Blues finished the first half well.
Royals boss Nigel Adkins made 11 changes at the break and Jake Taylor fired over from close-range five minutes after the restart.
However, Blues were still creating openings of their own as Cowan-Hall escaped down the right before just clearing the crossbar with a cross-shot.
Ainsworth made three changes 10 minutes into the second half with Marvin McCoy, Jesse Kewley-Graham and a trialist replacing Charles Dunne, Lewis and Cowan Hall.
And the Wanderers drew level from the spot five minutes later when Wood was brought down by Stephen Kelly after being released by Morgan.
It was Morgan who took the spot-kick, and he made no mistake, sending Adam Federici the wrong way for his third goal in as many games.
That was to be the forward’s last involvement as he made way along with Ingram, Arnold and a trialist for Charlie Horlock, Junior Morias, Jo Kuffour and Jon-Paul Pittman.
Stewart did well to block Danny Williams’ close-range effort, before being replaced in the 68th minute as Ainsworth made his final three changes. Hause and Spring were the other men to be replaced with Leon Johnson, Tommy Fletcher and Max Kretzschmar coming on.
Jobi McAnuff saw a strike deflected just wide, but the Blues were still looking threatening and Pittman headed Wood’s corner wide.
The Championship outfit retook the lead 15 minutes from time when Russia international Pavel Pogrebynak headed home McAnuff’s corner from five yards.
The number of changes had disrupted Wanderers’ rhythm and the hosts added to their tally a minute from time when Williams sidefooted in Garath McCleary’s cross from eight yards.
Wanderers: Ingram (Horlock 60), Arnold (Morias 60), Dunne (Trialist 55), Stewart, Hause, Cowan-Hall (McCoy 55), Lewis (Kewley-Graham 55), Spring, Wood, Morgan (Morias 60), Trialist (Pittman 60).
Reading: Taylor, Gunter, Bridge, Morrison, Gorkss, Drenthe, Guthrie, Karacan, Obita, Le Fondre, Blackman.
Second half: Federici, Cummings, Mariappa, Pearce, Kelly, McAnuff, Williams, Akpan, Taylor, McCleary, Pogrebnyak