On Friday, Petersen made 29 saves as Notre Dame held off the Black Bears' third-period surge to complete the 3-2 win.
Petersen was less active the next night but still had to make a few key stops as the Fighting Irish scored four unanswered goals to take a 4-2 decision.
The third-year goaltender has appeared in all 30 games this season, going 17-9-4 with a 2.11 goals-against average and a .924 save percentage.
Petersen's 80-game start streak is the fifth-longest in the history of NCAA Men's Division I Hockey.
The Fighting Irish continued to play without Connor Hurley (2013, second round), who has officially been ruled out for the remainder of the season with an undisclosed issue. Hurley ends the year with four goals and 16 points in 21 games.
Cliff Pu (2016, third round) saw his six-game point streak halted Wednesday in London's 4-3 shootout win at Flint, and then snapped his eight-game goal drought Friday with his 28th and 29th markers of the year as London outlasted Kitchener 5-2.
Pu remains among the league leaders this season with 29 goals (t-12th) and 68 points (t-5th) through 47 games.
Austin Osmanski (2016, seventh round) played to a cumulative minus-2 rating as Mississauga won twice in three tries. Osmanski has appeared in 42 contests, scoring one goal and six points while racking up 56 penalty minutes.
Giorgio Estephan (2015, sixth round) recorded a pair of assists in Wednesday's 7-3 triumph at Red Deer, and another helper on Friday as Lethbridge doubled Prince Albert 4-2. Estephan was blanked in Saturday's 5-0 loss at Medicine Hat, but returned with an assist in Sunday's 6-4 icing of Kootenay.
Estephan is second in team scoring with 67 points (26+41) in 53 games.
Brandon Hagel (2016, sixth round) went without points in Wednesday and Friday losses to Lethbridge and Swift Current, but got back on track with a helper in Saturday's 4-3 overtime loss to Regina. The assist boosted Hagel's career-high points total to 52 (21+31) through 49 contests.
Devante Stephens (2015, fifth round) logged a minus-2 rating Wednesday as Kelowna was smoked at Kamloops 6-0. He and his teammates reversed their fortunes over the weekend as Stephens finished with plus-3 and plus-1 efforts in 6-0 and 5-0 shellackings of Vancouver. The 20-year-old defender has nine goals, 21 points and a plus-16 rating in 51 games.
Vojtech Budik (2016, fifth round) connected for an assist Friday as Prince Albert battled to a 3-2 overtime loss at Medicine Hat. Budik, who fished the week without a point in a loss to Lethbridge and a shootout win at Kootenay, has 16 assists in 47 games for the last-place Raiders.
Prince George defenseman Brendan Guhle (2015, second round) did not take part in the action last week as he remains sidelined with a lower body injury. Guhle, whose status has been marked "week to week," has 12 goals and 12 assists in 40 games split between the Cougars and Prince Albert.
Vasily Glotov (2016, seventh round) scored his 12 goal of the year Sunday and added an assist as Cape Breton defeated Victoriaville 4-2. Glotov, who on Friday assisted on the game-winner in a 4-1 win over Sherbrooke, has 44 points in his first 50 North American contests.
In Monday's opening round of the Beanpot, Sean Malone (2013, sixth round) notched one assist as Harvard advanced to the championship game with a 4-3 win over Northeastern. Malone went on to score his 14th goal of the year Friday as the Crimson blew past Union 6-2.
Malone has been impressive all season long, snatching 28 points while appearing in all 24 games. Harvard squares off with Boston University in the Beanpot Championship on Monday evening.
Also in Beanpot action, Boston College defenseman Casey Fitzgerald (2016, third round) saw his three-game point streak snapped as the Eagles fell to Boston University 3-1. Fitzgerald recorded two shots on goal Saturday in a 6-3 loss to Merrimack, leaving the sophomore defender with four goals and 19 points in 28 games.
Boston College sophomore Christopher Brown (2014, sixth round) did not play in the week's two games. Brown has seven goals and 22 points through 28 outings.
Max Willman (2014, fifth round) picked up an assist Saturday as Brown was edged 2-1 at Colgate. Willman, who was unable to connect in a 5-3 loss at Cornell on Sunday, has 10 goals and 21 points at the 25-game mark.
Ivan Chukarov (2015, seventh round) was held without a point over the weekend as Massachusetts dropped a 6-2 decision at Northeastern and a 4-2 loss at Massachusetts-Lowell. At the 30-game mark, Chukarov has one goal, seven points and 61 shots on goal.
Judd Peterson (2012, seventh round) finished with a plus-1 rating and one shot on goal Friday as St. Cloud State defeated Miami 4-2. Peterson earned one assist the following night to snap a 13-game point drought in the Huskies' 3-1 win over the RedHawks. Peterson's first point since December 10 gives the third-year man 14 (9+5) in 30 games.
St. Cloud State sophomore Will Borgen (2015, fourth round) continued to display his rock-solid defensive presence over the weekend in the sweep of Miami. Through 29 games, Borgen has 11 points (2+9), a plus-6 rating and a team-high 46 penalty minutes.
Anthony Florentino (2013, fifth round) recorded a combined eight shots on goal and a plus-1 rating as Providence swept a home-and-home series with 4-1 and 4-3 victories over Connecticut. Florentino has eight goals and 15 points in 23 appearances for the Friars.
Brett Murray (2016, fourth round) was in the lineup for both weekend tilts for the second straight weekend as Penn State cruised to 6-3 and 5-2 triumphs at Wisconsin. Murray has played in six games since joining the Nittany Lions for the second semester, notching one assist and seven shots on goal.
Connecticut defenseman Philip Nyberg (2016, fifth round) was unable to suit up over the weekend as the Huskies were swept by Providence. Nyberg has four assists, including three on the power play, in his first 10 collegiate contests.
With the Swedish Hockey League off last week, Farjestad BK centerman Rasmus Asplund (2016, second round) remains with three goals and 15 points in 29 games. He missed the previous four games with an injury.
Through 40 games, Frolunda HC winger Victor Olofsson (2014, seventh round) has gathered nine goals and 21 points.
Gustav Possler (2013, fifth round) is 10 games into his return from ankle surgery, posting two goals and three points in limited work.
In HockeyAllsvenskan, Jonas Johansson (2014, third round) made 32 stops Wednesday as Almtuna IS was blanked by VIK Vasteras HK 3-0. On Friday, Johansson allowed four goals on 26 shots in a 5-2 loss to IK Pantern. Johansson has posted a 13-15 record this season with a 2.29 GAA and a .911 save percentage.
For more on all the youngsters in the Sabres pipeline, check out Kris Baker's website, SabresProspects.com. You can also follow him on Twitter (@SabresProspects) for in-game updates throughout the week on any Buffalo prospects that are in action.