[4][6] In June 2010, it was reported that he had teamed up with Elena Yarkhunova and was training with her under coach Oleg Vasiliev in Saint Petersburg, Russia and Chicago, Illinois.

Della Monica/Guarise were named along with Italian champions Stefania Berton / Ondrej Hotarek as Italy's pairs entries at the 2014 Winter Olympics in Sochi.

[13] In the 2014–15 season, Della Monica/Guarise competed at two Grand Prix events, placing fifth at the 2014 Cup of China and sixth at the 2014 Trophée Éric Bompard.

The 2016–17 season saw the duo win two Challenger events, the 2016 Lombardia Trophy and 2016 Golden Spin of Zagreb.

"[15] They won a second silver medal at the 2018 Rostelecom Cup, becoming the first Italian pair team to qualify for the Grand Prix Final, a goal they had set for themselves at the beginning of the year.

They placed third in the short program, 0.12 points ahead of Aleksandra Boikova / Dmitrii Kozlovskii of Russia, and were awarded a small bronze medal for the result.

[22] Della Monica dislocated her shoulder during the summer, significantly delaying the team's training.

They returned to competition at the 2019 Icelab International in Italy, taking the silver medal, a week before their first Grand Prix.

[25] After winning the Italian title again, Della Monica/Guarise competed at the 2020 European Championships, placing fourth.

[26][27] They had been assigned to compete at the World Championships in Montreal, but these were cancelled as a result of the coronavirus pandemic.

[28] Della Monica/Guarise were scheduled to compete on the Grand Prix at the 2020 Internationaux de France, but the event was cancelled due to the pandemic.

[31][32][33] Della Monica/Guarise began the season on home soil at the Lombardia Trophy, where they won the gold medal.

[34] They were initially assigned to the 2021 Cup of China as their first Grand Prix of the season, but following the event's cancellation, they were reassigned to a special home 2021 Gran Premio d'Italia, hosted in Turin.

Della Monica said afterward that she intended to retire at the end of the season to start a family, while Guarise expressed a desire to continue, joking, "maybe she can be my coach one day.

[40] In the pairs event, they placed tenth in the short program after Della Monica fell on her jump attempt.

[2] On the end of his partnership with Della Monica, he commented "in life, people take different directions, but we have to remember the journey together with a smile.

[44] At their second Challenger event, the 2023 CS Nebelhorn Trophy, they won the silver medal, their first international podium together.

[49] They finished third in the short program with a new personal best score, but then unexpectedly won the free skate and took the gold medal, 3.05 points ahead of Georgian silver medalists Metelkina/Berulava.

[53] Although the pair were scheduled to compete on the 2024–25 Grand Prix circuit at 2024 Skate Canada International and 2024 NHK Trophy, they would withdraw from both events due to Beccari sustaining a foot injury.

[54] In December, Beccari announced that she and Guarise would miss the remainder of the season due to her needing to undergo surgery for her injury.