UEFA.com looks at the key statistics from matchday one, including another home win for Real Madrid CF, Xavi Hernández's landmark and Yacine Brahimi's debut to remember.
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• Real Madrid CF's match against FC Basel 1893 was their 201st in the UEFA Champions League – a new competition record. Manchester United FC had previously shared the mark with Madrid on 200.
• With their 5-1 win against the Swiss side, Madrid also improved their UEFA Champions League records for most victories (117), most goals scored (420) and highest goal average per game (2.089).
• Basel have now conceded five goals or more in a UEFA Champions League fixture on five occasions, matching the competition high previously shared by SK Sturm Graz and RSC Anderlecht.
• Madrid's triumph was their ninth in a row at home in the UEFA Champions League, equalling the club's previous highest sequence of wins set between 1996 and 1998. The competition best is 12, set by Manchester United between 2006 and 2008.
• FC Porto registered the biggest UEFA Champions League margin of victory for two and a half years with their 6-0 defeat of FC BATE Borisov. They are only the fifth club to win by that scoreline and the first since Arsenal FC beat another Portuguese team, SC Braga, in September 2010 – those two results are the biggest matchday one successes.
• Porto midfielder Yacine Brahimi marked his debut in the UEFA Champions League proper with a hat-trick – the first scored by a Porto player in 147 matches.
• Brahimi is the seventh player to score a hat-trick on his UEFA Champions League debut, after Marco van Basten (AC Milan), Faustino Asprilla (Newcastle United FC), Yakubu (Maccabi Haifa FC), Wayne Rooney (Manchester United FC), Vincenzo Iaquinta (Udinese Calcio) and Grafite (VfL Wolfsburg).
• Germany this week became the fourth nation to play in more than 500 UEFA Champions League matches, the games involving Borussia Dortmund, Bayer 04 Leverkusen, FC Bayern München and FC Schalke 04 lifting the country's all-time tally to 502. Spain leads the way with 676, followed by England (641) and Italy (570).
• The appearance on matchday one of debutants PFC Ludogorets Razgrad and Malmö FF means that 130 clubs have now taken part in the group stage.
• Ludogorets' 2-1 defeat at Liverpool FC leaves Bulgaria – uniquely among the competition's 31 participating nations – still searching for its first UEFA Champions League point. The only previous participants from that country, PFC Levski Sofia in 2006/07, lost all six matches, scoring just one goal and conceding 17.
• In appearing for FC Barcelona against APOEL FC on Wednesday, Xavi Hernández moved alongside his compatriot Raúl González with the joint most UEFA Champions League appearances – 142, group stage to final. Madrid's Iker Casillas is one appearance behind – level with Ryan Giggs, who retired at the end of last season.
• Cristiano Ronaldo's goal for Madrid against Basel was his 68th in the UEFA Champions League, taking him one ahead of Barcelona's Lionel Messi and into second place on the all-time scorers' charts – three behind Raúl.
Mike Hammond is the editor of the European Football Yearbook, the 2014/15 edition of which is out now.