Greg Docherty’s first Hull City goal rescued a point at lowly Oxford in front of 1,000 fans at the Kassam Stadium.
James Henry’s 10th-minute strike put the U’s in front but the Tigers hit back midway through the second period when Docherty volleyed home.
A first draw of the campaign leaves Hull City two points clear at the top of League One.
Grant McCann named an unchanged team for Hull City’s first trip to Oxford in 17 years.
The Tigers were playing in front of a crowd for the first time in 273 days, with 1,000 socially-distanced U’s fans in attendance at the three-sided Kassam Stadium.
Encouraged by the support, Karl Robinson’s side started in lively fashion and went ahead inside 10 minutes when Henry steered a crisp right-footed drive into the bottom corner from 20 yards.
The visitors, who had earlier been denied a penalty when Docherty went down, looked rattled by the Yellows’ high tempo start and played second fiddle in a difficult opening half-hour.
Ron Atkinson motored through the middle and fed Jordan Obita whose cross was met by Matty Taylor but his header floated harmlessly wide.
The Tigers began to find their feet as half-time approached, with Docherty having a goalbound shot blocked amid a crowd of bodies from a Callum Elder corner.
Mallik Wilks outmuscled Josh Ruffels and drove into Oxford territory before curling a left-footed shot towards the bottom corner but home glovesman Jack Stevens held smartly.
Hull City players and staff were incredulous on 56 minutes when George Honeyman’s header sent Docherty clean through on goal but referee Andy Woolmer pulled play back for a Tigers free-kick.
Keane Lewis-Potter took responsibility for the set-piece, curling a fine 30-yard effort over the wall but a full-stretch Stevens tipped over.
The Tigers kept cranking up the pressure, with Alfie Jones crashing a powerful header against the face of the bar from Elder’s in-swinging corner.
Hull City had scored in every previous league game – one of only three sides in England’s top four divisions to do so – and that run was not about to end.
With 68 minutes played, Honeyman’s free-kick was cleared only as far as Docherty, who lashed a thumping volley into the net for his first Tigers goal.
Sensing victory, Honeyman curled a long-range attempt into the arms of Stevens and Lewis-Potter headed Josh Emmanuel’s cross over but a second goal proved elusive.
Oxford United: Jack Stevens, Josh Ruffels, Elliott Moore ©, Alex Gorrin (John Mousinho 75’), Matty Taylor (Dan Agyei 85’), Sam Long, James Henry, Marcus McGuane (Sean Clare 75’), Rob Atkinson, Jordan Obita, Liam Kelly (Anthony Forde 85’).
Subs: Simon Eastwood, Rob Hall, Olamide Shodipo.
Hull City: Matt Ingram; Josh Emmanuel, Alfie Jones (Reece Burke 59’), Jacob Greaves, Callum Elder; Richie Smallwood ©, George Honeyman, Greg Docherty; Mallik Wilks, Josh Magennis (Tom Eaves 65’), Hakeeb Adelakun (Keane Lewis-Potter 45’).
Subs: George Long, Lewie Coyle, James Scott, Regan Slater.