Oxford denied table-topping Bolton a ninth straight win to give their new boss Des Buckingham a point in his first home game in charge, which ended goalless.
But Wanderers had the satisfaction of keeping a clean sheet for the seventh game in a row in league and cup games to equal a 123-year-old club record.
Oxford were hoping to give Buckingham a first win and bounce back from a surprise 2-0 defeat at lowly Cheltenham last Saturday.
They had skipper Elliott Moore back after suspension at centre-half, and he made a big difference, several times cutting out dangerous situations.
Stanley Mills should have put United in front just before the break when Billy Bodin played him in – but Nathan Baxter superbly diverted his shot for a corner.
Cameron Brannagan then curled a 30-yard effort over Baxter, only to see it hit the top of the bar.
Brannagan almost caught Baxter off his line at a free-kick with a brilliant effort, yet Baxter was equal to it, scampering back to turn it over the bar.
Wanderers stepped up a gear in the second half and Dion Charles skied a very presentable chance 14 yards out and then saw a close-range drive well blocked by James Beadle.
The U’s keeper also kept out Jack Iredale’s angled blast, while substitute Jon Dadi Bodvarsson squandered a good opportunity at the far post.
Bolton almost snatched victory in stoppage time with George Thomason firing in a shot from the edge of the box that Beadle saved to his right on the line.
Al-Nassr 1-1 Al-Hilal: Mitrovic scores last-gasp penalty
Aleksandar Mitrovic scored a penalty in the 10th minute of second-half stoppage time as Al-Hilal denied Cristiano Ronaldo's Al-Nassr victory in a 1-1 draw.
Mitrovic netted his 27th Saudi Pro League goal of the campaign after Sadio Mane was harshly judged to have fouled Saud Abdulhamid in the area.
Mane stuck out an arm to shield the ball, catching his opponent in the throat, though the contact appeared to have been outside of the box.
Mitrovic made no mistake to keep Al-Hilal's unbeaten campaign going.
The Serbian's spot-kick cancelled out Otavio's first-minute opener, with Ronaldo having set up his compatriot.
Champions Al-Hilal remain 12 points clear of Al-Nassr at the summit of the Pro League standings.
Data Debrief: Ronaldo the provider
Ronaldo leads the scoring charts in Saudi Arabia this season, though he had to settle for an assist on Friday.
That came from the only chance he created, with the 39-year-old limited to 25 touches, though he did have four shots.
Al-Ittihad pegged back as winless run rolls on
Mohamed Sherif scored late on as Al-Ittihad's winless run in the Saudi Pro League stretched to four games after a 1-1 draw with Al-Khaleej.
Al-Ittihad have endured a miserable title defence, and with just two games remaining, the highest the big-spending, PIF-backed club can finish is fourth.
Muhannad Al Shanqiti put them ahead on the stroke of half-time, yet despite having a further eight shots and accumulating 1.07 xG in the second half, Al-Ittihad could not add another.
Their profligacy proved costly in the 81st minute, with Egypt international Sherif snatching an equaliser for 11th-placed Al-Khaleej.
Al-Tai moved out of the relegation zone with a surprise 3-1 win over seventh-placed Al-Fateh, with Bernard Mensah scoring twice.
Al-Raed, meanwhile, claimed a 1-0 win at Al-Wehda.
Data Debrief: Kante the creator?
On the day he received a surprising France recall, N'Golo Kante created three chances for Al-Ittihad, leading the team.
On the flip side, Kante only attempted one tackle, with the midfielder showing a different side to his game, not that it proved fruitful for his team.
Ronaldo motivated to keep playing at top level
Cristiano Ronaldo has no intention of stopping as he says he is still motivated to compete with the "young lions" coming through in the game.
Ronaldo is reportedly considering signing a contract extension to keep him at Al-Nassr until June 2026, taking him past his 41st birthday.
The Portugal international has scored 42 goals in 41 appearances for the Saudi Pro League club this season, and he insists he is still motivated to keep going.
Speaking on the Whoop podcast, he said: "I feel proud to have this age and still compete at the highest level. It's great, and it gives me motivation to carry on.
"If you look at my career for the last 20 years, my level is high. If you are top for 20 years, it's unbelievable.
"I do that, and I continue to do that. For me, it's a big achievement."
Ronaldo has scored an incredible 891 goals in his career and is the all-time leading scorer in men’s international football with 128 goals.
"My biggest motivation is to carry on," he added. "It's not easy to be at this level.
"To still push, to still motivate, to carry on, to score goals, to be in good shape, to compete with the young lions that are coming and that when they play against me, they want to show me that they are stronger and faster than me.
"You have to prepare very well, not just physically but mentally, too. This is the challenge.
"Talent without work is nothing and work without talent is nothing. They have to work together at the same time. I have both. I can't say that I have more of one than the other.
"Small details will make the difference. Consistency is the most difficult thing.
"Are you willing to do that? That's the main point, because everyone wants to be Cristiano, but doing it is difficult. Discipline is the most difficult thing."
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