Given the question: Information:  - Weight classes are divisions of competition used to match competitors against others of their own size. This reduces the exclusion of smaller athletes in sports where physical size gives a significant advantage. Weight classes are used in a variety of sports, especially combat sports (such as boxing, wrestling, and mixed martial arts).   - Professional boxing, or prizefighting, emerged in the early twentieth century as boxing gradually attained legitimacy and became a regulated, sanctioned sport. Professional boxing bouts are fought for a purse which is divided between the boxers as determined by contract. Most professional bouts are supervised by a regulatory authority to guarantee the fighters' safety. Most high-profile bouts obtain the endorsement of a sanctioning body, which awards championship belts, establishes rules, and assigns its own judges and referee.  - Welterweight is a weight class in combat sports. Originally the term "welterweight" was used only in boxing, but other combat sports like Muay Thai, taekwondo and mixed martial arts also use it for their own weight division system to classify the opponents. In most sports that use it, welterweight is heavier than lightweight but lighter than middleweight.  - Jeff Mayweather (born July 4, 1964 in Grand Rapids, MI) is a former boxer who fought in the 1990s.  - Boxing is a combat sport in which two people wearing protective gloves throw punches at each other for a predetermined set of time in a boxing ring.  - Muay Thai is a combat sport of Thailand that uses stand-up striking along with various clinching techniques. This physical and mental discipline which includes combat on shins is known as "the art of eight limbs" because it is characterized by the combined use of fists, elbows, knees, shins, being associated with a good physical preparation that makes a full-contact fighter very efficient. Muay Thai became widespread internationally in the twentieth century, when practitioners defeated notable practitioners of other martial arts. The professional league is governed by The Professional Boxing Association of Thailand (P.A.T) sanctioned by The Sport Authority of Thailand (S.A.T.), and World Muaythai Federation (WMF) overseas.  - Super featherweight, also known as junior lightweight, is a weight division in professional boxing, contested between and up to .  - Roger Mayweather ( born April 24 , 1961 ) is a retired professional boxer . He won two major world titles in two different weight classes . Throughout his career , Mayweather fought against many other boxing champions of the 1980s and 1990s . He is a part of the Mayweather boxing family ; his brothers are former welterweight contender Floyd Mayweather and former IBO super featherweight champion Jeff Mayweather , and his nephew is five - division world champion Floyd Mayweather Jr. Roger eventually became Mayweather Jr. 's trainer .  - Mixed martial arts (MMA) is a full-contact combat sport that allows both striking and grappling, both standing and on the ground, using techniques from other combat sports and martial arts. The first documented use of the term "mixed martial arts" was in a review of UFC 1 by television critic Howard Rosenberg in 1993. The term gained popularity when newfullcontact.com, then one of the largest websites covering the sport, hosted and republished the article. The question of who actually coined the term is subject to debate.  - In combat sports where champions are decided by a challenge, the lineal championship of a weight class is a world championship title held initially by an undisputed champion and subsequently by a fighter who defeats the reigning champion in a match at that weight class. In professional boxing, the lineal champion is informally called "the man who beat the man". Champions recognized by sanctioning bodies such as the World Boxing Association (WBA) or World Boxing Council (WBC), or the Ultimate Fighting Championship (UFC) may vacate their title voluntarily, or be stripped of the title for breaching the sanctioning body's regulations or contracts. There will thus be a breach of continuity in the list of sanctioned champions which the lineal championship is intended to prevent. However, there is no single canonical list of lineal champions at any weight class, because there is no agreed upon method of determining the starting point for each lineage and conflicting opinions on what to do when the current champion retires or moves to a different weight class, although there is agreement that any stripping of a title be discounted.  - The Best Fighter ESPY Award (ESPY means Excellence in Sports Performance Yearly) was created by the cable television network ESPN and has been presented annually since 2007 to the professional or amateur boxer or mixed martial artist, irrespective of nationality, gender, weight class, or sanctioning body or league, adjudged to be the best in a given calendar year. The award subsumed the Best Boxer ESPY Award, limited exclusively to boxers, which was presented between 1993 and 2006, inclusive.   - A combat sport, or fighting sport, is a competitive contact sport with one-on-one combat. Determining the winner depends on the particular contest's rules. In many fighting sports, a contestant wins by scoring more points than the opponent or by disabling the opponent. Boxing, wrestling, Muay Thai, Tae Kwon Do, Judo, Brazilian Jiu-jitsu, Sambo, and Mixed Martial Arts are examples of combat sports.  - Lightweight is a weight class in the sports of boxing, kickboxing, mixed martial arts, and rowing.  - Floyd Joy Mayweather Jr. (born Floyd Joy Sinclair; February 24, 1977) is an American former professional boxer who competed from 1996 to 2015, and currently works as a boxing promoter. Widely considered to be one of the greatest boxers of all time, undefeated as a professional, and a five-division world champion, Mayweather won fifteen world titles and the lineal championship in four different weight classes (twice at welterweight). He is a two-time winner of "The Ring" magazine's Fighter of the Year award (1998 and 2007), a three-time winner of the Boxing Writers Association of America (BWAA) Fighter of the Year award (2007, 2013, and 2015), and a six-time winner of the Best Fighter ESPY Award (20072010, 20122014).    Given the information, choose the subject and object entities that have the relation of 'place of birth'.
The answer is:
roger mayweather , grand rapids