Not as far as the dictionary is concerned. Honestly you can argue it all you want but it isn't. is it a competition? yes is it a sport? no.
Competition doesn't = sport and vice versa. A competition that involves a sport will often be clearly defined as a Sports competition. Anything can be a competition, you can compete in how fast you can tap you fingers or ho loud you can yell Boggies however that doesn't make them a sport.
competition
Pronunciation:/kɒmpɪˈtɪʃ(ə

n/
noun
[mass noun]
the activity or condition of striving to gain or win something by defeating or establishing superiority over others:
there is fierce competition between banks
the competition for university places is greater than ever this year
[count noun] an event or contest in which people take part in order to establish superiority or supremacy in a particular area:
a beauty competition
[in singular] the person or people over whom one is attempting to establish one's supremacy or superiority; the opposition:
I walked round to check out the competition
Ecologyinteraction between animal or plant species, or individual organisms, that are attempting to gain a share of a limited environmental resource.
http://oxforddictionaries.com/definition/competition
sport
Pronunciation:/spɔːt/
noun
1 an activity involving physical exertion and skill in which an individual or team competes against another or others for entertainment:
team sports such as soccer and rugby
2 informal a person who behaves in a good or specified way in response to teasing, defeat, or a similarly trying situation
3 Biologyan animal or plant showing abnormal or striking variation from the parent type, especially in form or colour, as a result of spontaneous mutation.
http://oxforddictionaries.com/definition/sport
definition
Pronunciation:/dɛfɪˈnɪʃ(ə

n/
noun
1 a statement of the exact meaning of a word, especially in a dictionary.
an exact statement or description of the nature, scope, or meaning of something:
our definition of what constitutes poetry
[mass noun] the action or process of defining something.
2 [mass noun] the degree of distinctness in outline of an object, image, or sound.
the capacity of a device to make images distinct in outline:
[in combination] :
high- definition television
http://oxforddictionaries.com/definition/definition
opinion
Pronunciation:/əˈpɪnjən/
noun
1 a view or judgement formed about something, not necessarily based on fact or knowledge:
that, in my opinion, is right
the area's residents share vociferous opinions about the future
[mass noun] the beliefs or views of a group or majority of people:
the changing climate of opinion
an estimation of the quality or worth of someone or something:
I had a higher opinion of myself than I deserved
2 a statement of advice by an expert on a professional matter:
if in doubt, get a second opinion
Lawa barrister's advice on the merits of a case.
Lawa formal statement of reasons for a judgement given.
http://oxforddictionaries.com/definition/opinion