Bicycle Mechanics - Broken Spokes

I had my bike shipped to me here after being on vacation and during shipment a spoke was broken. I got it replaced and have been riding it for about a month now. Yesterday I was doing some sprinting and a spoke broke. Its on the same wheel that had the broken one from shipping. I'm no petacchi so I shouldnt have been going THAT hard to break a spoke! My question is:since a spoke has been broken is the wheel overall weaker now? i.e. Im more likely to keep breaking spokes? Its a Giant OCR1 so not a race machine, the rims are mavic cxp-21's. Any thoughts?

Breaking a single spoke should not be a sign that the wheel has other problems. I broke a spoke in a corner one day and didn't know it... I remember the high-pitch 'ping' when it broke but thought it was a rock hitting the frame.

It wasn't until I put the bike in the car that I saw the slight warp in the wheel. Replaced the spoke and put another 7000 miles on the wheel.

I suspect a different problem. Because your first spoke was broken during shipping, whatever the stress was that caused it to break was probably constant and has possibly weakend the other spokes on the wheel.

Can't say how long this will contine. If the wheel is fairly new, and it sounds like it, I would probably trust and hope that this other spoke was the last one damanged in the shipping. If another breaks you may be better off paying to have the wheel re-laced.

I also have a Giant OCR1 with the CXP21 rims. Once I broke the first spoke, they started breaking left and right ~1 per month. After the first three the RIM has gotten tweaked in such a way that the shop can't really get it into true anymore and there's also a hop in it. In order to get it close to being true several spokes are quite loose, and these I believe are the most prone to break. A good wheel guy if they take the time to, not just replace the broken spoke but re-tension everything before you ruin the wheel should probably help. I'm pretty sure that this didn't happen in my case. There's also alot of info on this forum about CXP21 tendency to break spokes. For what it is worth I weight 220 and had about 2800 miles on then wheelset before experiencing any problems. I imagine that if I did a little preventative maintenance and had the wheels looked at/fine tuned/trued/re-tensioned at some point perhaps the problems wouldn't have started in the first place.

Sounds like a bad wheel build.