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|Full name||Mario Sačer|
|Date of birth||17 January 1990|
|Place of birth||Varaždin, SFR Yugoslavia|
|Height||1.77 m (5 ft 10 in)|
|2010||→ Varteks (loan)||22||(2)|
|2011–2012||→ Varaždin (loan)||20||(1)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 10 November 2013.
‡ National team caps and goals correct as of 9 February 2011
Sačer started playing football at 6 years of age for his hometown club Drava Sveti Đurđ, moving soon to Podravina in nearby Ludbreg and finally joining the youth ranks of Varteks in 2000. He came into the spotlight playing for the Varteks U-19 team, when he was named the best player and scorer of the Prva HNL Academy for the 2008-2009 season, amassing an impressive tally of 32 goals and 14 assists in 30 games, 11 goals more than the runners-up Andrej Kramarić and Valentino Stepčić. He made his first team debut for Varteks in May 2009, entering for the last 8 minutes in the game versus Osijek.
He joined the ranks of Hajduk Split, of which he stated to be an avid fan, in late June 2009. Not breaking through initially to the first team, he was sent on loan back to Varteks during the winter transfer season, losing, however, his place in the team in mid-March, due to the dispute of his two clubs regarding the transfer fee, but returning to the first team in May, scoring two goals in the last three games of the season. He remained on loan for the first half of the 2010–11 season, finding his position moved more and more moved to the right wing, and unable to regain his scoring streak. Returning to Hajduk Split, he was again sidelined, playing in only two games, one of which was 90 minutes against his former club. The following summer, he was again sent on loan to Varaždin for the 2011–12 season.