This particular topic has been a debate for almost a long time among the experts in golf, and up to now it still remains a debate. Marking the golf ball with an alignment line is favorable to some but others want it prohibited. Fact is that it's neither legal nor illegal which explains why there's a separation of opinions between the experts. Unless there's a new rule about this, then for now players can still mark their golf balls without getting a violation.

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Source: GOLF.com; RealFeelGolfMats