The term 'sports photography' covers a wide range of genres: from close by table tennis, through to basketball in rather dim arenas and field subjects like baseball or fast games like football or soccer. One lens is not going to be effective in all of those circumstances. So the variables come down to:
how close you are to the subject and that will dictate the focal lengths you are going to use
how much light there is and that will impact the aperture range
Thus, there is not single definitive solution: it depends. The critical factor right now is obviously budget, and as a starting point the RF-S 18-150 is going to offer as wide a range as you will get. As my colleague @kvbarkley indicated, much depends on where you are going to be and for that lens you need to be close. The aperture of f/2.8 will be more critical where light is limited, so can one infer that you are looking at indoor or evening sports?
Since you are obviously getting started on this photographic journey, I suggest you use this lens to learn about metering and the controls that let you get correctly exposed images: the so-called 'holy trinity' of:
Shutter speed: that controls the movement of the subject and the camera
Aperture: what you will get in focus and thus what you are telling your viewers is important
ISO: the amplification of the energy received by the sensor to record a correctly-exposed image. This is like turning up the gain in your stereo - making it louder will give more volume but also introduces more noise.
The combinations of these can offer a multitude of variables to get a correctly-exposed image, but each combination will render a different effect on the image. So, consider this period as a grounding in the basics of good photography and save up for lenses like the RF 24-240 or RF 100-400 for field sports. Also, look at the work of others in the genre and see how they work and what kinds of lenses they use to get their results:
I would recommend looking at videos by Brigham Young University:
How to Photograph Basketball - BYU Photo (youtube.com)
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
