What is the rubbing noise in front left tire?

Are the tires smooth or choppy as you look at the tread?
Run your hand along the tire tread,it should be smooth,no high or low spots.
High and low wear spots make a lot of noise on a tire.
Also,as you drive and hear the noise move the steering wheel slightly left and right,if you can change the noise at all then it may just be the wheel bearings.
Don't forget to make sure the metal inner dust shields beside the rotors are not touching anywhere on the rotors..

jack up front left on level ground ,support and chock rear wheels and set park brake ---look and check the cv axle for leaks,tears or damage -put in neutral and watch axle should turn smoothly turn steering wheel to left and rotate tire again watching axle if their is binding or grinding or studder movement than axle is damaged and needs to be replaced

have your wheel bearings checked.

If its not the bearing and your Mercury is front wheel drive, it could be the "CV" joints.
It could be both....

Is the wheel rubbing the brake caliper?

Is something like the wheel well liner rubbing the tire(airflow pushing it into tire)?

Jack the tire off the ground and rotate it by hand. Push in & out at the top, sides, and bottom of the tire. Little or no play is considered acceptable. If you get a "clunking" sound and/or a lot of play the bearing(s) are bad. (If front wheel drive, chock rear tires, put transmission in neutral so you can rotate tire.)

Hope this helps.

Try rotating your tires from front to back. It may help with the noise. Get a front-end alignment which can also help with the noise by correcting a "rub" sound that originates from the 2 front tires fighting each other for control.

The place which replaced your bearings is probably correct. When you get bad bearings they do not always fail evenly across the 360 degree turning of the bearing race. If you imagine a donut with a flat spot representing your bearing- as the donut spins with the flat spot cause by a disintegrating roller, the tire is bolted to the donut. The tire is going to hit the pavement differently every rotation because of the play in the bearing is at that same spot.

This play will create small cups in the tire shape at the low spot transmitted by the bearing. When you replaced the bearing , the marks in your tire tread remained. These edges need to be worn off. Or some tire stores can Shave a tire, in an attempt to make it round again.

If you have a normal size spare, you can put the spare on the left front side of your vehicle and see if the noise goes away. If the rims are different on the spare, you can have everything remounted and pay for rebalancing and put the unused spare as a front tire. Then you know the spare is at least good as a spare, but noisy.

You probably have a bad tire or wheel bearing. Either the tire is cupped causing humming noise or grease inside sealed wheel bearing is burnt up. I would take front tire and move to the back of the car. Then drive again. If noise stays the same you probably have a bad wheel bearing. If noise moves to the back of the car than you may need to replace the tire. Most likely it is the wheel bearing, I replace them all the time at my shop

If the noise is only when the vehicle is moving it sounds lek you have a bad wheel bearing. You can inspect ford move ment or play shaking the tires up and down and left to right while lifted up on hoist or jack. If there is no movement doesn't necesarily mean the bearings are okay, however if there is movement in bearing replace and drive again. Antoher way to determine Which wheel bearing is bad is to drive and turn to the left, if the noise gets louder than it mens the rightside wheel bearung is bad. If you turn to the right and noise gets louder replace driver side front wheel bearing. Also Rub your hands across your tires, does it feel wavy or uneven, you could have cupped tires, I DON'T KNOW HOW NEW THEY are but cupped tires will also make this noise. One way to see if it is the tires is to do a rotate If noise changes at all then you no its a tire causing noise. Hope this helps.

sounds like it could be wheel bearings but I'm surprised that when they rotate the tires they didn't catch this.

The next time you have your tires rotated ask to have the jacked up front end tested for loose front end parts. They can shake it down physically looking for play in the ball joints, tie rod ends, and bearings.

Struts generally wear out and cause a bouncy front end conditioin. Brakes, if properly assembled, won't make any additional noise when turning left or right.

Good luck on this.

check the wheel bearing sounds like a problem there.

It sounds exactly like a wheel bearing problem.The right side its seems would be the problem. When you turn right it puts more pressure on the bad bearing making it louder. I would suggest replacing both. If on is gone the other one isn't far off. Hope this helps