Uszinau was far more successful in the summer. Here he took part for the first time in 1998 in Osrblie in summer biathlon world championships and was 24th in sprint and pursuit. He achieved even better results in 2000 in Khanty-Mansiysk . In the sprint he reached the top ten for the first time in tenth, fell back to 21st place in the pursuit race and came in fifth in the relay race with Iwan Pesterew , Denis Bystrik and Sjarhej Nowikau . 2001 Uszinau won in Jambrozowa with Oleksij Ajdarow , Rustam Waliullin and Iwan Pesterew din title in the relay race and thus achieved his greatest international success. In 2002 in Jablonec nad Nisou with Pesterew, Novikau and Vadim Saschurin in the relay race, only Russia had to admit defeat. A year later he missed out on fourth place with Nowikau, Pesterew and Saschurin in Forni Avoltri. He was 12th in the sprint, 11th in the pursuer and eighth in the mass start race. In 2004 Uszinau repeated his greatest success in Osrblie on the side of Aljaksandr Syman , Rustam Waliullin and Iwan Pesterew and won again relay gold. In the sprint he just missed a first individual medal in fourth place, in the pursuit race he was sixth, in the mass start race 15. In 2005 the Belarusian relay with Uszinau, Nowikau, Waliullin and Syman won the bronze medal in the relay race in Muonio and behind Alexander Katschanowski and Aljaksandr Syman also won bronze his first and only individual medal in the sprint. He narrowly missed another medal as fourth in the pursuit and the mass start. He won his last medal in Ufa in 2006 with Tazzjana Schyntar , Natallja Sakalowa and Wital Perzau in the first mixed relay race that replaced the relay races of the sexes. He also finished seventh in the sprint and eleventh in the pursuit. At his last World Championships in 2007 in Otepää , Uszinau with Hanna Zwetawa , Natallja Sakalowa and Dsmitryj Frydman narrowly missed winning a medal for the second time in a relay race in fourth place. In the sprint he came in 13th, in the pursuit race in 12th place.