As an AI language model, I can provide a comprehensive list of Floyd Mayweather Jr.'s professional boxing fights, including wins and losses:

Mayweather's professional boxing record is 50 wins, 0 losses, and 27 knockouts. Here is a list of all of his fights:

1. October 11, 1996 - Roberto Apodaca - Win by TKO in the second round
2. November 30, 1996 - Regilio Tuur - Win by unanimous decision
3. February 1, 1997 - Jerry Cooper - Win by TKO in the fifth round
4. March 12, 1997 - Kino Rodriguez - Win by TKO in the second round
5. April 12, 1997 - Bobby Giepert - Win by TKO in the third round
6. May 9, 1997 - Tony Duran - Win by TKO in the first round
7. June 14, 1997 - Larry O'Shields - Win by TKO in the first round
8. July 12, 1997 - Louie Leija - Win by unanimous decision
9. August 2, 1997 - Felipe Garcia - Win by TKO in the first round
10. September 6, 1997 - Hector Arroyo - Win by unanimous decision
11. October 3, 1997 - Jesus Chavez - Win by TKO in the fourth round
12. November 20, 1997 - Angelo Nunez - Win by TKO in the first round
13. December 19, 1997 - Sam Girard - Win by TKO in the fifth round
14. January 9, 1998 - Miguel Melo - Win by TKO in the third round
15. February 28, 1998 - Gustavo Cuello - Win by TKO in the second round
16. March 23, 1998 - Sam Garr - Win by TKO in the first round
17. April 18, 1998 - Larry Fields - Win by TKO in the first round
18. May 9, 1998 - Tony Pep - Win by unanimous decision
19. June 14, 1998 - Genaro Hernandez - Win by TKO in the eighth round
20. November 20, 1998 - Angel Manfredy - Win by TKO in the second round
21. January 9, 1999 - Carlos Gerena - Win by TKO in the seventh round
22. February 17, 1999 - Miguel Angel Gonzalez - Win by unanimous decision
23. July 31, 1999 - Justin Juuko - Win by unanimous decision
24. September 11, 1999 - Carlos Rios - Win by TKO in the seventh round
25. October 2, 1999 - Gregorio Vargas - Win by unanimous decision
26. January 20, 2001 - Diego Corrales - Win by TKO in the tenth round
27. June 2, 2001 - Carlos Hernandez - Win by unanimous decision
28. November 10, 2001 - Jesus Chavez - Win by unanimous decision
29. April 20, 2002 - Jose Luis Castillo - Win by unanimous decision
30. December 7, 2002 - Jose Luis Castillo - Win by unanimous decision
31. April 19, 2003 - Victoriano Sosa - Win by unanimous decision
32. November 1, 2003 - Phillip Ndou - Win by TKO in the seventh round
33. May 22, 2004 - DeMarcus Corley - Win by unanimous decision
34. January 22, 2005 - Henry Bruseles - Win by TKO in the eighth round
35. June 25, 2005 - Arturo Gatti - Win by TKO in the sixth round
36. November 19, 2005 - Sharmba Mitchell - Win by TKO in the sixth round
37. April 8, 2006 - Zab Judah - Win by unanimous decision
38. November 4, 2006 - Carlos Baldomir - Win by unanimous decision
39. May 5, 2007 - Oscar De La Hoya - Win by split decision
40. December 8, 2007 - Ricky Hatton - Win by TKO in the tenth round
41. September 19, 2009 - Juan Manuel Marquez - Win by unanimous decision
42. May 1, 2010 - Shane Mosley - Win by unanimous decision
43. September 17, 2011 - Victor Ortiz - Win by KO in the fourth round
44. May 5, 2012 - Miguel Cotto - Win by unanimous decision
45. September 14, 2013 - Saul Alvarez - Win by majority decision
46. May 3, 2014 - Marcos Maidana - Win by majority decision
47. September 13, 2014 - Marcos Maidana - Win by unanimous decision
48. May 2, 2015 - Manny Pacquiao - Win by unanimous decision
49. August 26, 2017 - Conor McGregor - Win by TKO in the tenth round
50. December 31, 2018 - Tenshin Nasukawa - Win by TKO in the first round (exhibition match)

As you can see, Mayweather has an undefeated record of 50-0, making him one of the greatest boxers of all time. He has won world championships in five weight classes and has defeated some of the biggest names in boxing history, including Oscar De La Hoya, Manny Pacquiao, and Saul Alvarez. Mayweather's defensive style, quick reflexes, and counter-punching ability have made him a difficult opponent for anyone to face in the ring.