Echoes of replacement refs.One item in the labour agreement the NFL struck with its game officials in 2012 after the lockout called for all-star crews working the post-season.The NFL Referees Association insisted on it. The league was so eager to get the regulars back on the field after the replacement officials debacle that it agreed.After the uproar surrounding one specific non-call in the Detroit-Dallas wild-card game Sunday — and other calls made or ignored over the weekend — lots of people are wondering why the NFL gave in.Generally, before 2004 the highest-rated full crews worked playoff games and the Super Bowl. That changed to a hybrid system in 04 that allowed for eliminating lower-rated officials on some crews from working the post-season.Moving to the current all-star approach allows for officials rated highest at each position by supervisors to get the premium assignments. But it also can rob the crews working the critical January and February games of the cohesion developed through a full preseason and regular season.Regardless, until the CBA with the officials union runs out after next years post-season, the all-star format is in effect.So how are these officials evaluated?—Officiating supervisors rate performances of on-field referees, umpires, linesmen and judges every week on every play. All of the supervisors are former on-field officials.The crewmembers get to see those weekly reports.—Officials get an accuracy percentage on their calls for the entire season, which takes into account the calls made and missed, and calls that should have been made, says Dean Blandino, director of NFL officiating.—Then the officials are grouped into three tiers based on that accuracy percentage of their calls. Those in Tier 1 are eligible for playoff assignments, including the Super Bowl and the conference championships.Those in Tier 2 will fill in the blanks and handle some of the other playoff games.If an official is in Tier 3, he gets no post-season assignments and could be up for employment review, Blandino says.Seniority is not taken into account.—Once placed in a tier, the officials are divided up based on other criteria. That includes decisiveness, clarity of explanations, control of the game, physical fitness, and several other categories.The officials who rate best overall are chosen to work the post-season.—No crew will work more than two games. The Super Bowl crew will handle one of this weekends games, meaning that Pete Morellis group that worked the Lions-Cowboys contest will not do the big game.For the Super Bowl crew, we want them to work one game, and the divisional round is best, Blandino says. Its not that long a break after the season or before the Super Bowl. It fits right in the middle.Often, several of the officiating crew members will have worked a game or more during the regular season, perhaps even much of the schedule. For Lions-Cowboys, Blandino says four of the officials had been at the same regular-season game, but none had worked with Morelli in 2014.As for which particular games the crews get in the first two rounds of the playoffs, Blandino says the NFL will look at the matchups and the two teams and tendencies, and then look at the officials and if they fit for certain matchups.Could the assignment system be changed once the CBA with the officials union concludes?Its definitely something to look at after the 2015 season, Blandino says, but at this point there is no strong opinion one way or the other.___AP NFL website: www.pro32.ap.org and www.twitter.com/AP_NFLDenis Potvin Jersey . 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Second-seeded Irina-Camelia Begu of Romania advanced easily by beating Kateryna Kozlova of Ukraine 6-3, 6-1, while No. Mike Bossy Jersey . Nikolai Khabibulin was yanked in the second period, and the Ottawa Senators looked ready to put away a big road win.BALTIMORE (9-5) at HOUSTON (7-7)Sunday, 1 p.m. ET, CBSOPENING LINE — Baltimore by 3 1/2RECORD VS. SPREAD — Baltimore 8-6, Houston 8-6SERIES RECORD — Ravens lead 6-1LAST MEETING — Ravens beat Texans 30-9, Sept. 22, 2013LAST WEEK — Ravens beat Jaguars 20-12; Texans lost to Colts 17-10AP PRO32 RANKING — Ravens No. 10, Texans No. 17RAVENS OFFENSE — OVERALL (10), RUSH (5), PASS (14)RAVENS Defence — OVERALL (13), RUSH (3), PASS (30)TEXANS OFFENSE — OVERALL (15), RUSH (4), PASS (25)TEXANS Defence — OVERALL (24), RUSH (14), PASS (26)STREAKS, STATS AND NOTES — QB Joe Flacco threw for 221 yards last week to become first player in franchise history to reach 25,000 yards passing (25,024). ... Flacco has seven touchdowns with one interception in last five games. ... Steve Smith had 37 yards receiving last week to pass Steve Largent for 15th on all-time list with 13,123. ... RB Justin Forsett, who spent 2012 with Houston, is fifth in NFL with 1,128 yards rushing. ... WR Torrey Smith needs two touchdown catches to become second player in franchiise history with 10 or more receiving touchdowns in single season.dddddddddddd Michael Jackson had 14 in 1996... LB C.J. Mosley, 17th pick in draft, leads rookies with 117 tackles. ... LB Terrell Suggs had 2 1/2 sacks last week and has 10 1/2 in his last nine games. ... Houston QB Ryan Fitzpatrick had season-ending surgery Monday after breaking leg on Sunday. Case Keenum or Thad Lewis will get first start of season. ... Keenum lost each of his eight starts for Texans last season. ... Lewis has made six starts in career. ... RB Arian Foster is averaging second-most yards rushing per game in NFL at 102.5. ... WR Andre Johnson (996) needs five catches to pass Hines Ward for ninth in NFL history. ... WR DeAndre Hopkins has 44 receptions for 801 yards in last eight games. ... DE J.J. Watt needs 3 1/2 sacks to become first player in NFL history with two seasons with at least 20 sacks. ... 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