Question: The 1973 DFB-Pokal Final included a self-subsitution by which German midfielder?

Context paragraphs:
2008 DFB-Pokal Final: The 2008 DFB-Pokal Final decided the winner of the 2007–08 DFB-Pokal, the 65th season of Germany's premier knockout football cup competition.  The match took place on 19 April 19, 2008 between thirteen-time winners Bayern München and two-time winners Borussia Dortmund.  The final was played in front of 70,000 at Berlin's Olympiastadion.  Bayern ran out 2–1 winners in extra time, thanks to two strikes from Italian forward Luca Toni, gaining their 14th DFB-Pokal title and gaining the first trophy of a league and cup double.

1974 DFB-Pokal Final: The 1974 DFB-Pokal Final decided the winner of the 1973–74 DFB-Pokal, the 31st season of Germany's knockout football cup competition.  It was played on 17 August 1974 at the Rheinstadion in Düsseldorf.  Eintracht Frankfurt won the match 3–1 against Hamburger SV after extra time, to claim their 1st cup title.

1976–77 DFB-Pokal: The 1976–77 DFB-Pokal was the 34th season of the annual German football cup competition.  It began on 6 August 1976 and ended on 30 May 1977.  128 teams competed in the tournament of seven rounds.  In the final FC Köln defeated Hertha Berlin 1–0 in a replay after the first game ended in a draw after 120 minutes.  It was the only DFB-Pokal final ever to be replayed.

1971–72 DFB-Pokal: The 1971–72 DFB-Pokal was the 29th season of the annual German football cup competition.  It began on 4 December 1971 and ended on 1 July 1972.  32 teams competed in the tournament of five rounds.  In the final Schalke 04 defeated Kaiserslautern 5–0, the largest margin by which a DFB-Pokal final was ever decided.

1992–93 DFB-Pokal: The 1992–93 DFB-Pokal was the 50th season of the annual German football cup competition.  83 teams competed in the tournament of seven rounds which began on 18 August 1992 and ended on 12 June 1993.  In the final Bayer Leverkusen defeated the second team of Hertha Berlin 1–0.  It was the first time a third tier team made it to the DFB-Pokal final, and the only time a reserve team has.

1973 DFB-Pokal Final: The 1973 DFB-Pokal Final, which decided the winner of the 1972–73 DFB-Pokal, took place on 23 June 1973 between Borussia Mönchengladbach and 1.  FC Köln in the Rheinstadion in Düsseldorf.  The sports magazine "kicker" described it as one of the "best, highest energy, and exciting" DFB-Pokal matches ever played.  It was in this match that Günter Netzer infamously substituted himself on.  Shortly after this, Netzer scored what would be the winning goal for Borussia.

2009 DFB-Pokal Final: The final of the 2008–09 DFB-Pokal season was held on 30 May 2009 at the Olympiastadion, Berlin.  Werder Bremen won with a 58th-minute goal from midfielder Mesut Özil.  This was the club's sixth DFB-Pokal in its history, after victories in 1961, 1991, 1994, 1999 and 2004.  This was Bayer Leverkusen's DFB-Pokal final loss of the decade, the other occurring in 2002.  Werder Bremen lost the 2009 UEFA Cup final ten days prior to the DFB-Pokal final, losing to Ukrainian side Shakhtar Donetsk.

Verbandspokal: The Verbandspokal (English: Association Cup) is a regional football competition in Germany.  There are 21 Verbandspokal competitions which function as qualifying tournaments for the following seasons DFB-Pokal, the premier German Cup competition.  While no Verbandspokal winner has ever gone on to win the German Cup two have reached the final.  Hertha BSC Amateure won the Berlin Cup in 1992 and went on to lose the 1992–93 DFB-Pokal final against Bayer 04 Leverkusen and FC Energie Cottbus won the 1996 Brandenburg Cup and went on to lose the 1996–97 DFB-Pokal final against VfB Stuttgart.

2007 DFB-Pokal Final: The 2007 DFB-Pokal Final decided the winner of the 2006–07 DFB-Pokal, the 64th running of Germany's premier football cup competition.  In the final, 1.  FC Nürnberg defeated VfB Stuttgart 3–2 after extra time, thereby claiming their fourth title and denying Bundesliga champions Stuttgart a double.  A 109th-minute strike from Danish midfielder Jan Kristiansen won the game for Nürnberg.

Günter Netzer: Günter Theodor Netzer (born 14 September 1944 in Mönchengladbach) is a former German football player and team general manager currently working in the media business.  As a player, he played as an attacking midfielder, and was considered to be one of the greatest passers in the game's history.  As such, he was voted Footballer of the Year in Germany twice, in 1972 and 1973.

Supporting paragraphs: 1973 DFB-Pokal Final Günter Netzer
Answer: Günter Theodor Netzer