Ivanov started a career in mixed martial arts in his home country (2 wins and 1 NC) before going to
World Victory Road, where he signed a three-fight deal. His first fight took place at
Sengoku 9 where he defeated
Pride FC veteran,
Kazuyuki Fujita by split decision, breaking both hands in the process. Ivanov was set next to face Fedor's brother,
Aleksander Emelianenko, but that fight and eventually the entire event on which the fight should have occurred was canceled because Blagoy had broken both his hands in the fight against Fujita and was not able to heal and prepare properly for his fight with Aleksander. Recently, in the capital city of Bulgaria -
Sofia, Bagata defeated another well-known Bulgarian MMA fighter Svetoslav Zahariev who was European champion in grappling, heavyweight division. In the interview given after the fight, Bagata said that he was ready for a rematch with Svetoslav, but also with his brother, who is a fighter too. He added that he needs more easy matches like the last one in order to get in shape for the real challenges. According to Blagoy, in December 2010 he would go to fight and train in Las Vegas, USA.
Bellator MMA On March 15, 2011, Ivanov announced that he had signed a deal to fight for
Bellator. He debuted on March 26, 2011, at
Bellator 38 against William Penn and won via first-round TKO. Ivanov was expected to face
Thiago Santos as part of a quarterfinals tournament at Bellator 52 on October 1 at the L'Audberge du Lac Casino Resort in Lake Charles, La. The tournament was to determine a No. 1 contender to face champion
Cole Konrad. Santos, however, was unable to travel from Brazil for the event and was replaced by
Zak Jensen. Ivanov defeated Jensen by technical submission due to a guillotine choke at 2:35 into round 2. The 2008 Combat Sambo World Champion Ivanov used superior boxing technique, speed, and accuracy to bloody the face, Jensen, in round one. Jensen offered little offense, and it bordered on a 10–8 round. An outside trip takedown from Ivanov started off the second frame, where he immediately began to crank on an Americana attempt. Jensen gave up full mount attempting to defend. Eventually, Jensen was able to scramble out, but as he drove forward attempting to push Ivanov against the fence he left his neck exposed. Ivanov locked in a tight guillotine choke that left Jensen unconscious and unable to tap. The impressive performance from Ivanov furthers his career-winning streak to eleven. On 24 Dec 2011, Ivanov defeated
Ricco Rodriguez in the third round via TKO with a kick to the upper body that some felt hit Rodriguez's head, as he was still getting up from his knees. The fight took place in Chekhov, Moscow suburb, and Ivanov fought under the Russian banner.
Return to MMA Ivanov returned to MMA competition after a 21-month absence due to
injuries sustained in a bar fight and fought Manny Lara on September 13, 2013, at
Bellator 99. He won the fight via submission in the first round. Ivanov next fought on November 22, 2013, at
Bellator 109 and faced Keith Bell. Ivanov was initially dropped by Bell early into the fight, but recovered and won the fight via submission. In March 2014, Ivanov returned to the Heavyweight division. He faced
Rich Hale in the opening round of the
Bellator Season 10 Heavyweight tournament at
Bellator 111 on March 7, 2014. He won the fight via unanimous decision. He faced
Lavar Johnson in the semifinals at
Bellator 116 on April 11, 2014, and won via submission in the first round. He faced
Alexander Volkov in the tournament final on May 17, 2014, at
Bellator 120. He lost the fight via submission in the second round, resulting in his first professional loss.
World Series of Fighting On January 24, 2015, it was announced that Ivanov signed with WSOF. In his debut, Ivanov faced Smealinho Rama for the WSOF Heavyweight championship at
WSOF 21 on June 5, 2015 He won the fight and championship due to a submission in the third round. Ivanov made his first title defense against
Derrick Mehmen at
WSOF 24 on October 17, 2015. He won the fight via TKO in the second round. For his second title defense, Ivanov faced Josh Copeland at
WSOF 31 on June 17, 2016. He won the fight via unanimous decision (49–46, 49–46, and 48–47). For his third title defense, Ivanov faced
Shawn Jordan. The bout was originally scheduled for February 28 (incorrectly reported as Feb 25) but was rescheduled to March 18, 2017. Ivanov won the fight via TKO in the first round.
Ultimate Fighting Championship On April 25, 2018, it was reported that Ivanov was signed by
Ultimate Fighting Championship. He made his UFC debut against former
UFC Heavyweight champion Junior dos Santos on July 14 at
UFC Fight Night 133. He lost the fight via unanimous decision. In his second fight for the promotion, Ivanov faced
Ben Rothwell on March 9, 2019, at
UFC Fight Night 146. He won the fight by unanimous decision. In his third fight with the company, Ivanov faced
Tai Tuivasa on June 8, 2019, at
UFC 238. He won the fight by unanimous decision. Ivanov faced
Derrick Lewis on November 2, 2019, at
UFC 244. He lost the fight via split decision. Ivanov was scheduled to face
Augusto Sakai on May 9, 2020, at
UFC 250. However, on April 9,
Dana White, the president of UFC announced that this event was postponed and the bout eventually took place on May 30, 2020, at
UFC on ESPN: Woodley vs. Burns. He lost the fight via a split decision. Ivanov was expected to face
Marcin Tybura on March 27, 2021, at
UFC 260. However, Ivanov was pulled from the bout, citing injury. Ivanov faced
Marcos Rogério de Lima on May 7, 2022, at
UFC 274. He won the fight via unanimous decision. Ivanov faced
Marcin Tybura on February 4, 2023, at
UFC Fight Night 218. He lost the fight via unanimous decision. Ivanov faced
Alexander Romanov at
UFC on ESPN 48 on 1 July 2023. He lost the fight by unanimous decision. On July 20, 2023, it was announced that Ivanov was no longer on the UFC roster.
PFL Ivanov debuted with the
Professional Fighters League (PFL) at
PFL 1 on April 4, 2024, and lost his bout against Sergei Bilostenniy by unanimous decision. On 4 September 2024, Ivanov was suspended from competition by
USADA until January 2026 because of a failed test for anabolic steroids. ==Bar fight incident==