Mattar swam as a freshman at Indiana in 2008-09 before transferring to Northwestern with sophomore eligibility.
2011-12: Ranked on Northwestern's top times list in three different events ... Was second in the 200 fly and 400 IM and third in the 500 free ... Cut more than 10 full seconds off his in-season best in the 400 IM to make the Big Ten Championships consolation final of the event in an NCAA `B' provisional qualifying time of 3:52.27, eventually finishing 15th after a 3:55.07 in the finals ... Also scored for NU in the 200 fly, reaching the consolation final with a `B' cut of 1:47.30 before placing 13th in an evening time of 1:47.53 ... Also competed in the 500 free (46 th) at the conference meet ... Had five dual-meet event victories and 10 total top-three finishes on the year ... Qualified for the championship finals of the 200 fly and 50 fly at Northwestern's own five-team TYR Invitational (11/18-11/20), finishing fifth in the 200 and eighth in the 50 ... Won the TYR consolation heat of the 400 IM and also had bonus final swims in the 500 free (18th) and 50 free (24th).
2010-11: Ranked on NU's top times list for the year in three different events, coming in at No. 2 in the 200 free and 200 fly while placing third in the 500 free ... Qualified for the consolation final of the 200 fly at the Big Ten Championships with a career-best and NCAA `B' provisional qualifying time of 1:46.87 in the prelims before earning a 12th-place finish overall ... Chopped more than four seconds off his previous career-best in the 200 free to win the bonus final at the conference meet with an NCAA `B' cut of 1:38.07 ... Also made the bonus final of the 500 free at Big Tens, placing 22nd overall following a season-best and `B' time of 4:24.45 in the evening session ... Qualified for three consolation final berths at Northwestern's own five-team TYR Invitational (11/19-11/21), winning the heat in the 500 free and taking 10th in the 200 fly and 200 IM ... Won the bonus final of the 200 free at the TYR with a career-best time of 1:42.39 ... Had a strong dual meet against Notre Dame (01/12), taking second in the 200 fly and third in the 500 free ... Scored points with 14 total top-five dual meet finishes.
2009-10: Ranked second on Northwestern's top times list for the year in the 200 fly and 500 free, and third in the 1,000 free ... Scored points at the Big Ten Championships with a consolation final appearance in the 200 fly, swimming a season-best 1:48.32 in the evening heat to take 15th place ... Qualified for the bonus final of the 500 free at the Big Ten meet with an NCAA `B' provisional qualifying time of 4:26.99 before taking 23rd overall in the event ... Also made the bonus final of the 400 IM at the conference meet, slashing 5.3 seconds off his seed time during the prelims, then lowering it another 3.47 seconds at night to turn in a season-best 3:57.72 and take 21st place ... Made the championship final of the 400 IM at Northwestern's six-team TYR Invitational, taking eighth ... Was in the consolation final of the 200 fly at the TYR, placing 11th ... Also made the bonus final at the TYR in the 200 free (18th), 500 free (18th) and 200 IM (19th) ... Earned a dual-meet event victory in the 200 fly versus Carthage and Lewis (1/16) ... Had second-place dual meet finishes on the year in the 200 free, 500 free, 200 IM and 200 fly ... All told, had seven top-three dual-meet finishes.
2008-09 (AT INDIANA) Scored points at the 2009 Big Ten Championships with a 12th-place finish in the 200 fly (1:47.11) and 14th in the 400 IM (3:50.94) ... Finished 23rd in the 500 free at the Big Ten meet with a 4:24.23.
High School: Did not compete with high school swim team ... Swam club with the Oakland Live Y'ers from 2001-08 ... Four-time USA Swimming Scholastic All-America team member ... Michigan state champion in the 200 butterfly in 2006 ... Fourth in the 200 fly at the 2007 Central Zone Sectional Men's Open ... Also 13th in the 200 IM ... Top-20 finishes in the 50 fly and 200 fly and the 2007 NCSA Junior National Men's Open ... Led team to 2004 Michigan Swimming Combined Team Championship and 2006 USA Swimming Central Zone Sectional Men's Team Championship ... Michigan boy's record holder in the 15-16 200 short-course yards butterfly ... Lake Orion National Honor Society member ... also member of school's honor roll.
Personal: Born Anthony Dayton Mattar ... Son of Steve and Nancy Mattar ... Has an uncle who is a Kellogg School of Management graduate ... Swam club with NU teammate Alex Tyler ... Majoring in economics.
MATTAR'S PERSONAL BESTS| Event | Personal Best |
| 400 individual medley | 3:50.94 |
| 200 freestyle | 1:38.07 |
| 500 freestyle | 4:24.23 |
| 200 butterfly | 1:46.87 |