As you can see both My Lifesaver and Minted look similar to Mermaid Tears in the bottle, but on the nail, it's a whole different story...
Index: Mermaid Tears, Middle: My Life Saver, Ring: Mermaid Tears, Pinky: Minted
Index: Mermaid Tears, Middle: My Life Saver, Ring: Mermaid Tears
Ring: Mermaid Tears, Pinky: Minted
Please excuse my dinged nails lol... I was moving around a lot. Overall, My Lifesaver was closer to Mermaid Tears than Minted was, but it's still not a dupe. In the same color family, but there was just a hint of more blue in it. Not to mention more vibrant. Minted was a couple shade lighter than the OPI color, I was expecting that though.
I also wanted to mention that My Lifesaver is a little less blue/vibrant in real life... it's more like the bottle picture.