This is strange issue that people are looking at their web browser for opening google.com and it’s keep redirecting you to google.co.in every time. In past days if someone open google.com than first it opens the country level domain like google.co.in, google.co.jp or google.co.uk and at the home page you see Go to google.com link which takes you to the google.com search page.
Google customized its web page for a number of countries across the world. For example, Google.jp provides search results that are most relevant for users located in Japan and google.co.uk is basically open the page for UK based. Google has done some data centre facility enhancement and due to this they takes you to the nearest data centre for much faster results and this implementations has been done by Google to enhance the search engine speed and performance.
So now if you want to open google.com than you have to type http://www.google.com/ncr for opening google.com, /ncr stands for no country redirection which will disable your country redirection and open the main global Google page i.e. http://www.google.com