In one of the most anticipated boxing matches of 2021, Anthony Joshua took on Oleksandr Usyk in a heavyweight clash at the Tottenham Hotspur Stadium.Joshua was previously expected to face off against Tyson Fury. However, after 'The Gypsy King' was forced to back out and fight Deontay Wilder, Usyk stepped up to face the heavyweight Brit.Featured on the Anthony Joshua vs. Oleksandr Usyk undercard were a number of exciting fights that served as an excellent precursor for the heavyweight clash. Mandatory challenger Dilan Prasovic took on WBO cruiserweight champion Lawrence Okolie, whilst former WBA super-middleweight champion Callum Smith made his light-heavyweight debut against Lenin Castillo.Campbell Hatton, the son of Ricky Hatton, competed in his fourth pro fight against Sonni Martinez in a super-featherweight matchup.Florian Marku vs. Maxim Prodan at welterweight and Christopher Ousley vs. Khasan Baysangurov at middleweight made up the rest of the card.Anthony Joshua vs. Oleksandr Usyk: ResultsOleksandr Usyk def. Anthony Joshua (c) (117-112, 116-112, 115-113)A back and forth war between Oleksandr Usyk and Anthony Joshua truly gave fans everything they hoped for from this matchup. However, it was Oleksandr Usyk whose hand was raised at the end. Both men left it all in the ring in what is surely a Fight of the Year contender.Sky Sports Boxing@SkySportsBoxingA new unified heavyweight champion 👑🇺🇦 #JoshuaUsyk11:09 PM · Sep 25, 20211357316A new unified heavyweight champion 👑🇺🇦 #JoshuaUsyk https://t.co/hPr4vzk5rNLawrence Okolie (c) def. Dilan Prasovic via third-round TKOLawrence Okolie made his first title defense in emphatic fashion. He finished Dilan Prasovic with a brutal body shot, resulting in a third round TKO stoppage.DAZN Boxing@DAZNBoxingA statement victory for Lawrence Okolie 👏#OkoliePrasovic9:20 PM · Sep 25, 202117522A statement victory for Lawrence Okolie 👏#OkoliePrasovic https://t.co/9kG5FxwgyOCampbell Hatton def. Sonni Martinez via decision (58-57)Ricky Hatton's son got the nod on the undercard, but only just. Sonni Martinez appeared to be winning much of the fight, but it was Campbell Hatton whose hand was raised after a somewhat controversial decision, moving to 4-0.Sky Sports Boxing@SkySportsBoxingCampbell Hatton moves to 4-0 in London ⏫#JoshuaUsyk8:27 PM · Sep 25, 202120912Campbell Hatton moves to 4-0 in London ⏫#JoshuaUsyk https://t.co/dNrzJJ8x3kCallum Smith def. Lenin Castillo via second-round knockoutFormer champion Callum Smith made a successful light heavyweight debut. He knocked out Lenin Castillo in the second round.Sky Sports Boxing@SkySportsBoxingOff and running at 1️⃣7️⃣5️⃣@CallumSmith23 with a huge KO on his light-heavyweight debut 💥7:31 PM · Sep 25, 202125117Off and running at 1️⃣7️⃣5️⃣@CallumSmith23 with a huge KO on his light-heavyweight debut 💥 https://t.co/OyRXghxj7mFlorian Marku def. Maxim Prodan via split decision (91-99, 97-93, 96-94)Florian Marku opened the night with a win. He picked up a split decision over Maxim Prodan. It was a dominant display from Marku, who arguably deserved a unanimous decision victory.Sky Sports Boxing@SkySportsBoxingFlorian Marku wins via split decision! 🙌 Agree with the scores? 🇦🇱7:07 PM · Sep 25, 202132527Florian Marku wins via split decision! 🙌 Agree with the scores? 🇦🇱 https://t.co/VgIr6w2jNc