Asmer was born in Tallinn. He began karting in 1995, aged eleven, and had won the Estonian, Baltic, Finnish and Scandinavian kart championships by 2001. Asmer went on to make his car racing debut in 2003 and raced in British Formula Ford for team JLR. He scored six wins that season and finished in second place in the Formula Ford festival. Apart from a brief participation in the Formula Renault V6 Eurocup in 2003, Asmer's career was henceforth focused on Formula Three in Britain and Japan. He made his British series début in 2004 with Hitech Racing and, apart from a move to Japan in 2006, he has remained with the team in the years since. He became a championship title contender on his return to the British series in 2007, led the points standings for most of the season, and secured the title at Croft with three races remaining. His participations in All-Japan F3 have been confined to one and a half seasons with Three Bond Racing in 2006 and 2007, the latter of which was limited by competing in Britain. In 2008 Asmer was BMW Sauber's second test driver alongside Christian Klien and competed in seven of ten rounds in the GP2 Series for FMS International.
Retirement
Following the conclusion of the 2008 GP2 season Asmer parted ways with Fisichella Motor Sport and was unable to find a new team in GP2 for the 2009 season. Due to new rules restricting the amount of testing Formula 1 teams could carry out in-season he also lost his role as test and reserve driver for the BMW Formula 1 Team. With no competitive race seat for the 2009 season Asmer became a test and reserve driver in Superleague Formula series. On 8 April 2010 Toivo Asmer, the father of Marko Asmer, announced that Marko had ended his career in motorsport he had no race seat or test/reserve driver role for the 2010 season, and lack of funding meant that his son's career was finished. Despite this Asmer made a quick return to the cockpit the following week when he tested for the Atech team in a GP3 Series test session in Barcelona.
Return to competitive racing
In February 2011 Asmer returned to motorsport when he tested a British Formula 3 car for the Double R Racing team at Silverstone, during which he set competitive times. Staying with Double R Asmer finally returned to competitive racing when he competed in the Pau Grand Prix on 21–22 May 2011. Asmer qualified 10th and after a bad start found himself in last place, but showed good race pace and overtaking nous to finish 7th. Following his return to racing Asmer was interviewed by Autosport.com and revealed that he had spent his time out of professional motorsport "testing some cars, doing karting and... doing some driver coaching". He went on to say that he had no firm plans for the future, although he did want to take part in the Macau Grand Prix. Asmer also said that he would welcome a return to racing "if something good comes up", although a full-time return to British F3 would not interest him. Despite these claims it was announced on 28 July 2011 that Asmer would return to British Formula 3, again racing a Dallara-Mercedes for the Double R team at the Spa-Francorchamps round. Asmer qualified 18th for Race One at Spa, but then scored Double R's best qualifying result of the season, lining up second on the grid for the Feature Race. Asmer failed to finish in Race One or Two, but drove solidly to finish sixth in the Feature Race. However, his status as an invitational driver meant that he was not eligible to score championship points for this weekend. During this weekend it was also announced that Asmer had sponsorship in place to take part in the 2011 Macau Grand Prix, where he would drive a Dallara-Mercedes for a three-man Double R Racing team, alongside GP3 champion Valtteri Bottas and current GP3 Series racer Mitch Evans. In an interview with Autosport carried out over the Macau Grand Prix weekend Asmer reiterated his desire to get back into racing full-time, and said his future may lie in DTM.
Return to regular racing
In recent years Asmer has returned to actively racing in competitive international motorsport. He raced as part of a four-man team alongside Formula 2 race winner Kazim Vasiliauskas, driving a McLaren MP4-12C GT3 in the 2014 24 Hours of Spa with the GT Russian Team. He also competed in several rounds of the ADAC GT Masters. Asmer continued to race for GT Russian Team, taking part in the 2015 Blancpain GT Series, with his best result being a 7th-place finish in the main race in the final round in Zandvoort. He also raced in the top A6 category of the Dubai 24 Hour, again for the GT Russia Team.
