Question: Which retired Dutch footballer was the top scorer in the 2002-03 UEFA Champion's League?

Context paragraphs:
Ruud van Nistelrooy: Rutgerus Johannes Martinus "Ruud" van Nistelrooy (Dutch: "Ruud van Nistelrooij" ; ] ; born 1 July 1976) is a retired Dutch footballer and a current manager for the PSV youth team.  A former striker, he is the fourth-highest goalscorer in UEFA Champions League history with 56 goals.  He is a three-time Champions League top scorer, as well as a top scorer in three different European domestic leagues.

1990–91 Sunderland A.F.C. season: During the 1990–91 season Sunderland competed in the Football League First Division, the League Cup and the FA Cup.  They finished 19th in the First Division and were relegated.  Marco Gabbiadini was the top scorer in the First Division with 8 goals.  They were knocked out of the League Cup in Round 3.  Marco Gabbiadini was the top scorer in the League Cup with 2 goals.  They were knocked out of The FA Cup in Round 3.  No Sunderland players scored in the FA Cup.  Marco Gabbiadini was the top scorer in all competitions with 10 goals.  At the end of the season, Kevin Ball won the club's official Player Of The Season award, as well as the SAFC Supporters' Association Player Of The Season award.

2010–11 UEFA Europa League: The 2010–11 UEFA Europa League was the second season of the UEFA Europa League, Europe's secondary club football tournament organised by UEFA, and the 40th edition overall including its predecessor, the UEFA Cup.  It began on 1 July 2010, with the first qualifying round matches, and concluded on 18 May 2011, with the final at the Aviva Stadium in Dublin, Republic of Ireland, between Porto and first-time finalists Braga.  This was the first all-Portuguese final of a European competition and only the third time that two Portuguese teams faced each other in Europe, following Braga's elimination of Benfica in the semi-finals.  Porto defeated Braga 1–0, with a goal from the competition's top goalscorer Radamel Falcao, and won their second title in the competition, after victory in the 2002–03 UEFA Cup.

Daniel Stucki: Daniel Stucki (born 22 September 1981) is a retired Swiss footballer, He primarily played as a defender.  He was a member of FC Zürich's 2005-06 and 2006-07 Swiss Championship winning team.  He retired in January 2010 at the age of 28.  He started 31 games in his career.  In his final season of play, he was forced to sit our with an ankle injury during the UEFA Champion League.

1997–98 Atlético Madrid season: Atlético Madrid failed to regain the title they had won in 1996 and finished the season in 7th place.  One of the high points of the season was the club's run in the UEFA Cup, reaching the semi-finals.  Striker Christian Vieri was the club's top scorer, scoring 24 goals in La Liga (he finished as the league's top scorer and was awarded the Pichichi Trophy) and 29 in all competitions, but transferred to Lazio (who knocked Atlético out of the UEFA Cup) at the end of the season.

2003 UEFA Champions League Final: The 2003 UEFA Champions League Final was a football match that took place at Old Trafford in Manchester, England on 28 May 2003 to decide the winner of the 2002–03 UEFA Champions League.  The match was contested by two Italian teams: Juventus and Milan.  The match made history as it was the first time two clubs from Italy had faced each other in the final.  It was also the second intra-national final of the competition, following the all-Spanish 2000 UEFA Champions League Final three years earlier.  Milan won the match via a penalty shoot-out after the game had finished 0–0 after extra time.  It gave Milan their sixth success in the European Cup.

ABA League Top Scorer: The ABA League Top Scorer, also known as the Adriatic League Top Scorer, is an award given to the Top Scorer of each season of the European regional Adriatic ABA League, which is the top-tier level professional basketball league for countries of the former Yugoslavia.  The award has been given since the 2001–02 ABA League season.

2002–03 UEFA Champions League: The 2002–03 UEFA Champions League was the 11th season of UEFA's premier European club football tournament, the UEFA Champions League, since its rebranding in 1992, and the 48th European Cup tournament overall.  The competition was won by Milan, who beat Juventus on penalties in the European Cup's first ever all-Italian final, to win their sixth European title, and its first in nine years.  Manchester United's Ruud van Nistelrooy was again the top scorer, scoring 12 goals over the two group stages and knockout stage, in addition to two goals he had scored in the qualifying phase, although his side bowed out in the quarter-finals and missed out on the chance of playing in a final at their own stadium.

Petar Divić: Petar Divić (Serbian Cyrillic: Петар Дивић ; born 11 July 1975) is a Serbian international football player.  Divić is the only player in Serbia who was the top scorer in the first three leagues – first league top scorer with 27 goals for OFK Beograd in 2000–01, second league top scorer for CSK Celarevo with 20 goals in 1998–99 and third league top scrorer for Dinamo Pančevo with 27 goals in 1995–96.

Abdul Mumuni: Abdul Ali Mumuni (born 25 August 1973) is a former Ghanaian footballer who played as a forward.  He was the Ghanaian Premier League's top scorer while playing for Dawu Youngstars in the 1991–92 season.  This was the first and only occasion Mumuni was the league's top scorer and the first time Dawu Youngstars had had the league's top scorer.  Mumuni was also capped once for Ghana.

Supporting paragraphs: 2002–03 UEFA Champions League Ruud van Nistelrooy
Answer: Ruud van Nistelrooy