2006-07 Posted a 16-15 overall singles record, including 12-12 in duals and 6-4 in Big Ten play ... Anchored the No. 1 singles spot with a 7-10 record and went 5-2 at No. 2 singles ... Posted wins over No. 57 Blake Strode of Arkansas and No. 93 Chris Clayton of Harvard ... Ended the conference season on a three-match wining streak ... Anchored the No. 1 doubles spot with partner Matt Christian, going 11-12 in duals and 3-7 in the Big Ten ... Ranked as high as No. 27 nationally and No. 6 in the region in doubles, with a win over the No. 23 ranked team of Nolan Polley and Moritz Baumann of Wisconsin ... Won a match in the qualifying singles draw of the ITA All-American Championships ... Advanced to the second round of the main doubles draw with partner Matt Christian ... Won three matches in the qualifying draw ... Advanced to the round of 16 in doubles of the ITA Midwest Regional Championships with Christian ... Won a singles match at the Midwest Regional Championships ... Reached round of 16 at Big Ten Singles Championships.
2005-06: Went 16-10 overall, including a 15-7 dual and 7-4 Big Ten record ... Competed primarily at the No. 2 singles spot, where he went 14-7 ... Selected to compete in the 2005 Polo Ralph Lauren Championships ... One of five Wildcats to advance to the singles main draw and the round of 32 at the ITA Midwest Regional Championships ... Won six-consecutive singles matches from 2/11-3/6 ... Compiled a 3-2 record versus ranked opponents in dual singles play ... Beat Wake Forest's 35th-ranked Andrew Hamar at No. 2 singles (1/29) ... Ranked second on team for singles match winning percentage, with a .640 clip ... Went 11-12 overall in doubles ... Saw a majority of doubles action at the No. 2 spot alongside Christian Tempke ... Went 6-6 in Big Ten doubles play ... Alongside Tempke, won three-straight doubles matches from 4/2-4/9 ... Recorded a 1-3 fall singles record ... Posted a 0-1 fall doubles record.
2004-05: Team-best 25-10 overall, 19-6 dual, 9-1 Big Ten singles ... Went a perfect combined 5-0 at No. 3 and No. 5 positions, while seeing the bulk of action at No. 4 where he went 14-6 ... Recorded five-straight victories to begin spring season, including one over No. 18 ranked North Carolina ... Went undefeated in the month of April, winning eight-straight matches, including three victories over ranked teams ... Advanced to round of 64 at ITA All-American Championships ... Made it to Round of 32 at Big Ten Singles Championships ... Had 10-11 combined doubles record ... Most effective in doubles play with Justin Hoeveler, as the duo went 6-5 at No. 3.
2003-04: Compiled a 17-13 singles record, including 11-12 in dual action and 4-8 in the Big Ten ... Was 1-1 in singles at Big Ten Championships ... Went on a five-match winning streak from 1/25 to 2/7 ... Competed mostly at No. 4, but went 3-0 at No. 3 and 1-0 at No. 1 ... Posted a 5-3 record in doubles, including 3-1 in dual play and 1-0 in the Big Ten ... Played most with Ahmed Wahla, as they went 2-2 ... Won the 7-9 draw of the Big Ten Singles Championship ... Went undefeated at the Boilermaker Invitational.
High School: Played No. 1 singles and doubles for the Federacion Tenis Organization ... Took second place in the Peru National Championships ... No. 1 ranked junior in Peru ... Participated on Peru's Davis Cup Team, competing at No. 4 singles against the Bahamas and No. 3 singles against Canada ... Ranked 25th in class of 525 ... International Baccalaureate member.
Personal: Born Santiago William Lock on 1/25/85 ... Son of Santiago Andres Lock Sing and Ilda Montes Arguedas ... Chose Northwestern over Minnesota, Arkansas and Pepperdine ... Majoring in mechanical engineering.
Singles Record
| Year | Overall | Dual | Big Ten |
| 2003-04 | 17-13 | 11-12 | 4-8 |
| 2004-05 | 25-10 | 19-6 | 9-1 |
| 2005-06 | 16-10 | 15-7 | 7-4 |
| 2006-07 | 16-15 | 12-12 | 6-4 |
| Totals | 74-48 | 57-37 | 26-17 |