Nintendo always has a lot of sport games on their consoles. Counting Mario spin-offs, Wii series and other franchises:

-Soccer: Mario Strikers
-Basketball: Mario Hoops, Wii Sports Resort, Mario Sports Mix
-Tennis: Wii Sports, Mario Tennis
-Racing: Mario Kart, F-Zero, Diddy Kong Racing, Kirby Air Ride, and a lot more
-Golf: Wii Sports, Mario Golf
-Bowling: Wii Sports
-Boxing: Wii Sports, Wii Sports Resort, Punch Out
-Baseball: Mario Sluggers, Wii Sports,
-Volleyball: Mario Sports Mix
-Hockey: Mario Sports Mix
-Hunting: Duck Hunt
-Paintball: Splatoon (sort of)
-Archery: Wii Sports Resort
-Snowboarding:1080° Snowboarding
-Waterboarding: Wave Racer
-Chess: Wii Chess
-Olympics: Mario & Sonic

And that's without counting all the NES sports.

The problem I see is that almost all of those sports appear in collections of mini-games, and not in fully competitive sports. They need to make a game centered around one sport only, with the same dedication they put on Mario Kart.

http://www.amazon.com/New-Play-Control-Mario-Power-Tennis/dp/B001O1QLDO

This review might sum it up decently since it got pretty bad reviews on most game sites.

50 of 57 people found the following review helpful
2.0 out of 5 stars For Casual Players ONLY!! March 12, 2009
By Bruce Wayne
Fun: 2.0 out of 5 stars  
Don't be fooled, this not as great as the GC version. It's overly simplified for the gamers groomed on Wii sports. You control your characters movements with the Wii mote, however the ball goes in the direction suggested by your swing. Which sounds great and is, in small doses, but the game dosen't reach the fun or intensity level of being more specific with your shot direction. Many times the ball will automatically move toward your opponent despite the swinging motion. Which is a downer, because the whole point of tennis is to hit the ball AWAY from your opponent! This fault is too critical to ignore, and I reall wanted to like this game. But it's clear it was retooled for simpler games and less complex matches. If your looking for such a game, then this version of mario tennis is for you. But, if your looking for something with a little more depth and replayability do what I did, and just dust off the GC version and pop it in for an intense experience.

I was just thinking about Mario Strikers and how I absolutely loved it on Wii. I would hope we would hear of the Wii U version being developed by next years E3

It's really not weird. It's the same reason as why FIFA isn't there

FIFA isn't there because EA hates the Wii U.  FIFA 12 (I mean 15) is on the Wii.

I find it weird. Theres a market there and no one is taking advantage of it. 

It is very weird, is actually kind of stupid for both companies... EA already has the FIFA engine running on the Wii U (they released FIFA 13 after all) so they could be making a rooster update and sell it for cheap as they do for the Wii, and on the other corner is Konami who is not taking advantage that the console does not have competition on the genre and they could just port the 360 or the PS3 version so it cannot be very expensive, but I think their problem is that the new engine that they are using is not available for the console so it could get a little more expensive for the first time, but they should take into account that the Wii U already have some decent sales on Japan and Latin-America.

Just Give me Mario Strikers U and it'll be GOTG.

The markets not big enough for it to be worth it for anyone.